Allegheny County () is a

county A county is a geographic region of a country used for administrative or other purposes Chambers Dictionary, L. Brookes (ed.), 2005, Chambers Harrap Publishers Ltd, Edinburgh in certain modern nations. The term is derived from the Old French ...

in the

Commonwealth A commonwealth is a traditional English term for a political community founded for the common good. Historically, it has been synonymous with "republic". The noun "commonwealth", meaning "public welfare, general good or advantage", dates from the ...

Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...

. It is located in Southwestern Pennsylvania. As of the 2020 census, the population was 1,250,578, making it the state's second-most populous county, following

Philadelphia County Philadelphia County is a county in the Commonwealth of Pennsylvania. It is the most populous county in Pennsylvania. As of the 2020 census, Philadelphia County had a population of 1,603,797. The county is the second smallest county in Pennsyl ...

. The

county seat A county seat is an administrative center, seat of government, or capital city of a county or civil parish. The term is in use in Canada, China, Hungary, Romania, Taiwan, and the United States. The equivalent term shire town is used in the US ...

Pittsburgh Pittsburgh ( ) is a city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, United States, and the county seat of Allegheny County, Pennsylvania, Allegheny County. It is the most populous city in both Allegheny County and Wester ...

. Allegheny County is included in the

Pittsburgh, PA Metropolitan Statistical Area Greater Pittsburgh is a populous region centered around its largest city and economic hub, Pittsburgh, Pennsylvania. The region encompasses Pittsburgh's urban core county, Allegheny, and six adjacent Pennsylvania counties: Armstrong, Beaver, B ...

, and in the Pittsburgh Designated Market Area. Allegheny was the first county in Pennsylvania to be given a Native American name. It was named after the

Lenape The Lenape (, , or Lenape , del, Lënapeyok) also called the Leni Lenape, Lenni Lenape and Delaware people, are an indigenous peoples of the Northeastern Woodlands, who live in the United States and Canada. Their historical territory inclu ...

word for the

Allegheny River The Allegheny River ( ) is a long headwater stream of the Ohio River in western Pennsylvania and New York. The Allegheny River runs from its headwaters just below the middle of Pennsylvania's northern border northwesterly into New York then i ...

. The meaning of "Allegheny" is uncertain. It is usually said to mean "fine river". Stewart says that the name may come from a Lenape account of an ancient mythical tribe called ''"Allegewi"'', who lived along the river before being taken over by the Lenape.

History

Prior to European contact, this area was settled for thousands of years by succeeding cultures of indigenous peoples. During the colonial era, historic native groups known by the colonists to settle in the area included members of western nations of the

Iroquois The Iroquois ( or ), officially the Haudenosaunee ( meaning "people of the longhouse"), are an Iroquoian Peoples, Iroquoian-speaking Confederation#Indigenous confederations in North America, confederacy of First Nations in Canada, First Natio ...

, such as the Seneca; the

, who had been pushed from the East by European-American settlers; the

Shawnee The Shawnee are an Algonquian-speaking indigenous people of the Northeastern Woodlands. In the 17th century they lived in Pennsylvania, and in the 18th century they were in Pennsylvania, Ohio, Indiana and Illinois, with some bands in Kentucky a ...

, who also had territory in Ohio; and the

Mingo The Mingo people are an Iroquoian group of Native Americans, primarily Seneca and Cayuga, who migrated west from New York to the Ohio Country in the mid-18th century, and their descendants. Some Susquehannock survivors also joined them, and ...

, a group made up of a variety of peoples from more eastern tribes. European fur traders such as Peter Chartier established trading posts in the region in the early eighteenth century. Darlington map of Pennsylvania 1680

In 1749, Captain Pierre Joseph Céloron de Blainville claimed the

Ohio Valley The Ohio River is a long river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing southwesterly from western Pennsylvania to its mouth on the Mississippi River at the southern tip of Illin ...

and all of western Pennsylvania for King

Louis XV of France Louis XV (15 February 1710 – 10 May 1774), known as Louis the Beloved (french: le Bien-Aimé), was King of France from 1 September 1715 until his death in 1774. He succeeded his great-grandfather Louis XIV at the age of five. Until he reache ...

. The captain traveled along the

Ohio Ohio () is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Of the List of states and territories of the United States, fifty U.S. states, it is the List of U.S. states and territories by area, 34th-l ...

and Allegheny rivers. He installed lead plates in the ground to mark the land for France. Most of the towns during that era were developed along

waterway A waterway is any navigable body of water. Broad distinctions are useful to avoid ambiguity, and disambiguation will be of varying importance depending on the nuance of the equivalent word in other languages. A first distinction is necessary ...

s, which were the primary transportation routes, as well as providing water for domestic uses. Through the eighteenth century, both the French and the British competed for control over the local rivers in this frontier territory of North America. Native American bands and tribes allied with the colonists to differing degrees, often based on their trading relationships. The British sent Major

George Washington George Washington (February 22, 1732, 1799) was an American military officer, statesman, and Founding Father who served as the first president of the United States from 1789 to 1797. Appointed by the Continental Congress as commander of ...

to expel the French from their posts, with no success. He also nearly drowned in the ice-filled Allegheny River while returning to camp. The English tried again in 1754 to establish a post in the area. They sent 41 Virginians to build

Fort Prince George Fort Prince George was an uncompleted fort on what is now the site of Pittsburgh, at the confluence of the Allegheny and Monongahela Rivers in Allegheny County, Pennsylvania. The site was originally a trading post established by Ohio Company t ...

. The French learned of the plan and sent an army to capture the fort. They resumed building it and added increased defensive fortification, renaming it as

Fort Duquesne Fort Duquesne (, ; originally called ''Fort Du Quesne'') was a fort established by the French in 1754, at the confluence of the Allegheny and Monongahela rivers. It was later taken over by the British, and later the Americans, and developed a ...

. Given its strategic location at the Ohio, Fort Duquesne became an important focal point of the

French and Indian War The French and Indian War (1754–1763) was a theater of the Seven Years' War, which pitted the North American colonies of the British Empire against those of the French, each side being supported by various Native American tribes. At the st ...

. The first British attempt to retake the fort, the Braddock Expedition, failed miserably. In 1758 British forces under General John Forbes recaptured the fort; he had it destroyed to prevent any use by the French. The British built a new, larger fort on the site, including a moat, and named it Fort Pitt. The historic site has been preserved as Pittsburgh's Point State Park. Under their colonial charters, both Pennsylvania and

Virginia Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the Atlantic Coast and the Appalachian Mountains. The geography and climate of the Commonwealth are ...

claimed the region that is now Allegheny County. Pennsylvania administered most of the region as part of its Westmoreland County. Virginia considered everything south of the

Ohio River The Ohio River is a long river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing southwesterly from western Pennsylvania to its mouth on the Mississippi River at the southern tip of ...

and east of the

to be part of its Yohogania County, and governed it from Fort Dunmore. In addition, parts of the county were located in the proposed British colony of Vandalia and the proposed U.S. state of Westsylvania. The overlapping boundaries, multiple governments, and confused deed claims soon proved unworkable. Near the end of the American Revolutionary War, in 1780 Pennsylvania and Virginia agreed to extend the

Mason–Dixon line The Mason–Dixon line, also called the Mason and Dixon line or Mason's and Dixon's line, is a demarcation line separating four U.S. states, forming part of the borders of Pennsylvania, Maryland, Delaware, and West Virginia (part of Virginia ...

westward. This region was assigned to Pennsylvania. From 1781 until 1788, much of what Virginia had claimed as part of Yohogania County was administered as a part of the newly created

Washington County, Pennsylvania Washington County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 209,349. Its county seat is Washington. Washington County is part of the Pittsburgh, PA Metropolitan Statistical Area. The county is ...

. Allegheny County was officially created on September 24, 1788, from parts of

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

and Westmoreland counties. It was formed to respond to pressure from the increase in settlers living in the area around Pittsburgh; this was designated as the

in 1791. The county originally extended north to the shores of

Lake Erie Lake Erie ( "eerie") is the fourth largest lake by surface area of the five Great Lakes in North America and the eleventh-largest globally. It is the southernmost, shallowest, and smallest by volume of the Great Lakes and therefore also ha ...

; it was reduced to its current borders by 1800. As population increased in the territory, other counties were organized. AlleghenyCtyCourthouse-082904

In the 1790s, the

United States federal government The federal government of the United States (U.S. federal government or U.S. government) is the national government of the United States, a federal republic located primarily in North America, composed of 50 states, a city within a fed ...

imposed a

whiskey Whisky or whiskey is a type of distilled alcoholic beverage made from fermented grain mash. Various grains (which may be malted) are used for different varieties, including barley, corn, rye, and wheat. Whisky is typically aged in wooden ...

excise tax. Farmers who had depended on whiskey income refused to pay and started the so-called

Whiskey Rebellion The Whiskey Rebellion (also known as the Whiskey Insurrection) was a violent tax protest in the United States beginning in 1791 and ending in 1794 during the presidency of George Washington. The so-called "whiskey tax" was the first tax impo ...

after driving off tax collector John Neville. After a series of demonstrations by farmers, President

sent troops to suppress the frontier rebellion. The area developed rapidly through the 1800s with industrialization. It became the nation's prime

steel Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistan ...

producer by the late 19th century and Pittsburgh was nicknamed "Steel Capital of the World". In 1913 the county's 125th anniversary was celebrated with a week-long series of events. The final day, September 27, was marked by a steamboat parade of 30 paddle wheelers. They traveled from

Monongahela Wharf The Monongahela Wharf was the key wharf of Pittsburgh, Pennsylvania, United States, on the Monongahela River. It was in use from the late 19th century until the dam was built in the Ohio river, causing it to be underwater. It was used by st ...

down the Ohio to the Davis Island Dam. The boats in line were the ''Steel City'' (formerly the Pittsburgh and Cincinnati packet ''Virginia''), the flag ship; ''City of Parkersburg'', ''Charles Brown'', ''Alice Brown'', ''Exporter'', ''Sam Brown'', ''Boaz'', ''Raymond Horner'', ''Swan'', ''Sunshine'', '' I. C. Woodward'', ''Cruiser'', ''Volunteer'', ''A. R. Budd'', ''J. C. Risher'', ''Clyde'', ''Rival'', ''Voyager'', ''Jim Brown'', ''Rover'', ''Charlie Clarke'', ''Robt. J. Jenkins'', ''Slipper'', ''Bertha'', ''Midland'' ''Sam Barnum'', ''Cadet'', ''Twilight'', and ''Troubadour''.

Geography

According to the

U.S. Census Bureau The United States Census Bureau (USCB), officially the Bureau of the Census, is a principal agency of the U.S. Federal Statistical System, responsible for producing data about the American people and economy. The Census Bureau is part of the ...

, the county has a total area of , of which is land and (1.9%) is water. Three major rivers traverse Allegheny County: the

and the

Monongahela River The Monongahela River ( , )—often referred to locally as the Mon ()—is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed August 15, 2011 river on the Allegheny Plateau in north-c ...

converge at Downtown Pittsburgh to form the

. The

Youghiogheny River The Youghiogheny River , or the Yough (pronounced Yok ) for short, is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed August 15, 2011 tributary of the Monongahela River in the U.S. ...

flows into the Monongahela River at McKeesport, to the southeast. There are several islands in these courses. The rivers drain via the

Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drainage system (geomorphology), drainage system in North America, second only to the Hudson B ...

into the

Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United ...

. Although the county's industrial growth resulted in

clearcutting Clearcutting, clearfelling or clearcut logging is a forestry/logging practice in which most or all trees in an area are uniformly cut down. Along with shelterwood and seed tree harvests, it is used by foresters to create certain types of fores ...

of the area's forests at one time, there has been regrowth and a significant woodland remains.

Adjacent counties

* Butler County (north) * Armstrong County (northeast) * Beaver County (northwest) * Westmoreland County (east and south) * Washington County (southwest)

Major roads and highways

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Climate

Allegheny has a

humid continental climate A humid continental climate is a climatic region defined by Russo-German climatologist Wladimir Köppen in 1900, typified by four distinct seasons and large seasonal temperature differences, with warm to hot (and often humid) summers and freez ...

which is hot-summer (''Dfa'') except in higher areas where it is warm-summer (''Dfb'').

Law and government

Until January 1, 2000, Allegheny County's government was defined under Pennsylvania's Second Class County Code. The county government was charged with all local activities, including elections, prisons, airports, public health, and city planning. All public offices were headed by elected citizens. There were three elected county commissioners. On January 1, 2000, the Home-Rule Charter went into effect. It replaced the three elected commissioners with an elected chief officer (the County Executive), a county council with 15 members (13 elected by district, two elected county-wide), and an appointed county manager. The changes were intended to maintain a separation of powers between the executive and legislative branches while providing greater citizen control. Allegheny County Medical Examiner jeh

The county has 130 self-governing municipalities, the most in the state. ( Luzerne is second with 76). The county has one Second Class City (Pittsburgh) and three Third Class Cities ( Clairton, Duquesne, and McKeesport). A 2004 study found the county would be better served by consolidating the southeastern portion of the county (which includes many small communities with modest economies) into a large municipality ("Rivers City") with a combined population of approximately 250,000.

County Executive

* Rich Fitzgerald (D)

County Council

* Bethany Hallam (D), At-large * Tom Baker (R), District 1 * Cindy Kirk (R), District 2 * Anita Prizio (D), District 3 * Patrick Catena (D), President, District 4 * Tom Duerr (D), District 5 * John F. Palmiere (D), District 6 * Nicholas Futules (D), District 7 * Paul Zavarella (D), District 8 * Robert J. Macey (D), Vice President, District 9 * DeWitt Walton (D), District 10, * Paul Klein (D), District 11 * Robert Palmosina (D), District 12 * Olivia Bennett (D), District 13 * Samuel DeMarco III (R), At-large

Other elected county offices

* Controller, Corey O'Connor (D) * District Attorney, Stephen A. Zappala Jr. (D) * Sheriff, Kevin M. Kraus (D) * Treasurer, John K. Weinstein (D)

Politics

there were 939,382 registered voters in the county; a majority were Democrats. There were 534,214 registered Democrats, 264,193 registered Republicans, 98,958 registered as independents and 42,017 registered with other parties. The Republican Party had been historically dominant in county-level politics in the 19th and early 20th centuries; prior to the

Great Depression The Great Depression (19291939) was an economic shock that impacted most countries across the world. It was a period of economic depression that became evident after a major fall in stock prices in the United States. The economic contagio ...

, Pittsburgh and Allegheny County had been majority Republican. Since the Great Depression on the state and national levels, the Democratic Party has been dominant in county-level politics. It is by far the most Democratic county in western Pennsylvania. For much of the time between the Great Depression and the turn of the millennium, it was the second-strongest Democratic bastion in Pennsylvania, behind only Philadelphia. In 2000, Democrat

Al Gore Albert Arnold Gore Jr. (born March 31, 1948) is an American politician, businessman, and environmentalist who served as the 45th vice president of the United States from 1993 to 2001 under President Bill Clinton. Gore was the Democratic ...

won 56% of the vote and Republican George W. Bush won 41%. In 2004, Democrat

John Kerry John Forbes Kerry (born December 11, 1943) is an American attorney, politician and diplomat who currently serves as the first United States special presidential envoy for climate. A member of the Forbes family and the Democratic Party, he ...

received 57% of the vote and Republican Bush received 41%. In 2006, Democrats Governor

Ed Rendell Edward Gene Rendell (; born January 5, 1944) is an American lawyer, prosecutor, politician, and author. He served as the 45th Governor of Pennsylvania from 2003 to 2011, as chair of the national Democratic Party, and as the 96th Mayor of Philad ...

and Senator Bob Casey, Jr. won 59% and 65% of the vote in Allegheny County, respectively. In 2008, Democrat

Barack Obama Barack Hussein Obama II ( ; born August 4, 1961) is an American politician who served as the 44th president of the United States from 2009 to 2017. A member of the Democratic Party (United States), Democratic Party, Obama was the first Af ...

received 57% of the vote,

John McCain John Sidney McCain III (August 29, 1936 – August 25, 2018) was an American politician and United States Navy officer who served as a United States senator from Arizona from 1987 until his death in 2018. He previously served two te ...

received 41%, and each of the three state row office winners (

Rob McCord Robert Maxwell McCord (born March 5, 1959) is an American former politician and convicted felon. A member of the Democratic Party, he served as the Treasurer of Pennsylvania from 2009 to 2015. He was an unsuccessful candidate for the Democratic n ...

for Treasurer, Jack Wagner for Auditor General, and Tom Corbett for Attorney General) also carried Allegheny. In 2016, despite

Donald Trump Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who served as the 45th president of the United States from 2017 to 2021. Trump graduated from the Wharton School of the University of P ...

being the first Republican to carry Pennsylvania since 1988,

Hillary Clinton Hillary Diane Rodham Clinton ( Rodham; born October 26, 1947) is an American politician, diplomat, and former lawyer who served as the 67th United States Secretary of State for President Barack Obama from 2009 to 2013, as a United States sen ...

did slightly better than Barack Obama's 2012 vote total while Donald Trump was the worst performing Republican in 20 years. In the 2018 Midterms, Democrats received an even higher percentage of the vote with

Tom Wolf Thomas Westerman Wolf (born November 17, 1948) is an American politician and businessman serving as the 47th governor of Pennsylvania since 2015. A member of the Democratic Party, he defeated Republican incumbent Tom Corbett in the 2014 gu ...

and Bob Casey receiving approximately two thirds of the county's vote. This is an improvement over the approximately 55% each person received in the county in their last election in 2014 and 2012 respectively. In 2020, Joe Biden improved upon Clinton's performance, receiving the highest vote percentage for a Democrat since Michael Dukakis in 1988 and the most votes for a Democrat since LBJ in 1964.

State representatives

Source * Robert F. Matzie, Democratic, 16th district *

vacant Within the context of building construction and building codes, "occupancy" refers to the use, or intended use, of a building, or portion of a building, for the shelter or support of persons, animals or property. A closely related meaning is ...

., Democratic, 19th district * Emily Kinkead, Democratic, 20th district * Sara Innamorato, Democratic, 21st district * Dan Frankel, Democratic, 23rd district *

, Democratic, 24th district * Brandon Markosek, Democratic, 25th district * Daniel J. Deasy, Democratic, 27th district *

Rob Mercuri Rob Mercuri (born c. 1982) is an American politician. He has served as a member of the Pennsylvania House of Representatives since 2021, representing District 28. Early life and career Mercuri was raised in West Deer Township, and attended De ...

, Republican, 28th district * Lori Mizgorski, Republican, 30th district *

Anthony M. DeLuca Anthony M. DeLuca Sr. (June 3, 1937 – October 9, 2022) was an American politician of the Democratic Party (United States), Democratic Party. A longtime resident of the Pittsburgh suburb of Penn Hills, Pennsylvania, Penn Hills, he was a membe ...

, Democratic, 32nd district * Carrie DelRosso, Republican, 33rd district *

Summer Lee Summer Lynn Lee (born November 26, 1987) is an American politician and community organizer serving as the U.S. representative for Pennsylvania's 12th congressional district since 2023. A member of the Democratic Party, Lee served as a member of t ...

, Democratic, 34th district * Austin Davis, Democratic, 35th district * Jessica Benham, Democratic, 36th district * Nick Pisciottano, Democratic, 38th district *

Mike Puskaric Michael J. Puskaric (born May 8, 1989) is an American politician who represented the 39th District in the Pennsylvania House of Representatives from 2019 to 2022. Early life Puskaric was born on May 8, 1989, in Allegheny County, Pennsylvania ...

, Republican, 39th district *

Natalie Mihalek Natalie Nichole Mihalek is an American politician. She is a Republican representing District 40 in the Pennsylvania House of Representatives. Early life Mihalek served in the United States Navy from 1997 to 2000. Aftwards, she earned a Bache ...

, Republican, 40th district * Dan L. Miller, Democratic, 42nd district * Valerie Gaydos, Republican, 44th district * Anita Astorino Kulik, Democratic, 45th district * Jason Ortitay, Republican, 46th district *

Bob Brooks Bob Brooks (26 December 1927 – September 2012) was an American film director, photographer and advertising creative. He created numerous advertising campaigns, directed several thousand TV commercials in the UK, US and Europe, and directed ...

, Republican, 54th district

State senators

Devlin Robinson Devlin J. Robinson is an American businessman and politician who is the Pennsylvania State Senator The Pennsylvania State Senate is the upper house of the Pennsylvania General Assembly, the Pennsylvania state legislature. The State Senate meet ...

, Republican, 37th district * Lindsey Williams, Democrat, 38th district *

Wayne D. Fontana Wayne D. Fontana (born March 12, 1950) is an American politician who served as a Democratic member of the Pennsylvania State Senate, representing the 42nd District since 2005. Background Fontana was born and raised in the Beechview section ...

, Democrat, 42nd district *

Jay Costa Jay Costa (born November 17, 1957) is an American politician, currently serving as a member of the Pennsylvania State Senate who has represented the 43rd District since 1996. On November 17, 2010, Senate Democrats elected Costa as their new fl ...

, Democrat, 43rd district * James Brewster, Democrat, 45th district

U.S. representatives

* Conor Lamb, Democrat, 17th district *

Mike Doyle Michael, Mick or Mike Doyle may refer to: Politics * Michael Doyle (Irish politician), Irish Farmers' Party politician from Wexford, TD from 1922 to 1927 *Michael Doyle, alleged member of the Molly Maguires * Mike Doyle (American politician) (born ...

, Democrat, 18th district

Religion

In 2010 statistics, the largest religious group in Allegheny County was the Diocese of Pittsburgh, with 460,672 Catholics worshipping at 179 parishes, followed by 44,204 UMC Methodists with 100 congregations, 42,838 PC-USA Presbyterians with 145 congregations, 33,103

non-denominational A non-denominational person or organization is one that does not follow (or is not restricted to) any particular or specific religious denomination. Overview The term has been used in the context of various faiths including Jainism, Baháʼí Fait ...

adherents with 85 congregations, 24,718 ELCA Lutherans with 77 congregations, 17,148 ABCUSA Baptists with 42 congregations, 12,398 AoG Pentecostals with 30 congregations, 8,483 Reform Jews with 6 congregations, 7,780 TEC Episcopalians with 19 congregations, and 6,700

Hindus Hindus (; ) are people who religiously adhere to Hinduism. Jeffery D. Long (2007), A Vision for Hinduism, IB Tauris, , pages 35–37 Historically, the term has also been used as a geographical, cultural, and later religious identifier for ...

with four temples. Altogether, 60.6% of the population was claimed as members by religious congregations, although members of historically African-American denominations were underrepresented due to incomplete information. In 2014, Allegheny County had 794 religious organizations, the 11th most out of all US counties.

Demographics

As of the 2010 census, there were 1,223,348 people living in the county. The population density was 1676 people per square mile (647/km²). The racial makeup of the county was 82.87%

White White is the lightest color and is achromatic (having no hue). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully reflect and scatter all the visible wavelengths of light. White ...

, 14.39%

Black Black is a color which results from the absence or complete absorption of visible light. It is an achromatic color, without hue, like white and grey. It is often used symbolically or figuratively to represent darkness. Black and white ha ...

African American African Americans (also referred to as Black Americans and Afro-Americans) are an ethnic group consisting of Americans with partial or total ancestry from sub-Saharan Africa. The term "African American" generally denotes descendants of ens ...

, 2.94% Asian, 0.03%

Pacific Islander Pacific Islanders, Pasifika, Pasefika, or rarely Pacificers are the peoples of the Pacific Islands. As an ethnic/ racial term, it is used to describe the original peoples—inhabitants and diasporas—of any of the three major subregions of O ...

, 0.37% from other races, and 1.40% from two or more races. About 1.31% of the population were

Hispanic The term ''Hispanic'' ( es, hispano) refers to people, cultures, or countries related to Spain, the Spanish language, or Hispanidad. The term commonly applies to countries with a cultural and historical link to Spain and to viceroyalties for ...

or Latino of any race. At the

census A census is the procedure of systematically acquiring, recording and calculating information about the members of a given population. This term is used mostly in connection with national population and housing censuses; other common censuses inc ...

of 2000, there were 1,281,666 people, 537,150 households, and 332,495 families living in the county. The population density was 1,755 people per square mile (678/km²). There were 583,646 housing units at an average density of 799 per square mile (309/km²). The racial makeup of the county was 84.33%

, 12.41%

, 0.12% Native American, 1.69% Asian, 0.03%

, 0.34% from other races, and 1.07% from two or more races. About 0.87% of the population were

or Latino of any race. 20.0% were of

German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ge ...

, 15.0% Italian, 12.7% Irish, 7.5% Polish and 5.1% English ancestry according to Census 2000. 93.5% spoke English and 1.3% Spanish as their first language. There were 537,150 households, out of which 26.40% had children under the age of 18 living with them, 46.10% were married couples living together, 12.40% had a female householder with no husband present, and 38.10% were non-families. Some 32.70% of all households were made up of individuals, and 13.20% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.96. The age distribution of the population shows 21.90% under the age of 18, 8.50% from 18 to 24, 28.30% from 25 to 44, 23.40% from 45 to 64, and 17.80% who were 65 years of age or older. The median age was 40. For every 100 females, there were 90.00 males; for every 100 females age 18 and over, there were 86.20 males.

2020 Census

Economy

In the late 18th century

farming Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled peopl ...

played a critical role in the growth of the area. There was a surplus of grain due to transportation difficulties in linking with the eastern portion of the state. As a result, the farmers distilled the grain into

, which significantly helped the farmers financially. The area quickly became a key manufacturing area in the young nation. Coupled with deposits of iron and coal, and the easy access to waterways for

barge Barge nowadays generally refers to a flat-bottomed inland waterway vessel which does not have its own means of mechanical propulsion. The first modern barges were pulled by tugs, but nowadays most are pushed by pusher boats, or other vessels. ...

traffic, the city quickly became one of the most important steel producing areas in the world. Based on 2007 data from the US Army Corps of Engineers, Pittsburgh is the second (after

Laredo, Texas Laredo ( ; ) is a city in and the county seat of Webb County, Texas, United States, on the north bank of the Rio Grande in South Texas, across from Nuevo Laredo, Tamaulipas, Mexico. Laredo has the distinction of flying seven flags (the Flag of th ...

) busiest inland port in the nation. US steel production declined late in the 20th century, and Allegheny County's economy began a shift to other industries. It is presently known for its hospitals, universities, and industrial centers. Despite the decline of heavy industry, Pittsburgh is home to a number of major companies and is ranked in th
top ten
among US cities hosting headquarters of Fortune 500 corporations, including U.S. Steel Corporation,

PNC Financial Services The PNC Financial Services Group, Inc. (stylized as PNC) is an American bank holding company and financial services corporation based in Pittsburgh, Pennsylvania. Its banking subsidiary, PNC Bank, operates in 27 states and the District of ...

Group,

PPG Industries PPG Industries, Inc. is an American Fortune 500 company and global supplier of paints, coatings, and specialty materials. With headquarters in Pittsburgh, Pennsylvania, PPG operates in more than 70 countries around the globe. By revenue it is ...

, and H. J. Heinz Company. The county leads the state in number of defense contractors supplying the U.S. military.

Regions

* East Hills * North Hills * South Hills * West Hills *

City of Pittsburgh Pittsburgh ( ) is a city in the Commonwealth of Pennsylvania, United States, and the county seat of Allegheny County. It is the most populous city in both Allegheny County and Western Pennsylvania, the second-most populous city in Pennsyl ...

Education

Colleges and universities

Byzantine Catholic Seminary of SS. Cyril and Methodius The Byzantine Catholic Seminary of SS. Cyril and Methodius is an American degree-granting school of theology in Pittsburgh, Pennsylvania. The seminary prepares candidates for priestly ministry to the Byzantine Catholic churches of North America. A ...

* Carlow University *

Carnegie Mellon University Carnegie Mellon University (CMU) is a private research university in Pittsburgh, Pennsylvania. One of its predecessors was established in 1900 by Andrew Carnegie as the Carnegie Technical Schools; it became the Carnegie Institute of Technology ...

Chatham University Chatham University is a private university in Pittsburgh, Pennsylvania. Originally founded as a women's college, it began enrolling men in undergraduate programs in 2015. It enrolls about 2,110 students, including 1,002 undergraduate students ...

* DeVry University *

Duquesne University Duquesne University of the Holy Spirit ( or ; Duquesne University or Duquesne) is a private Catholic research university in Pittsburgh, Pennsylvania. Founded by members of the Congregation of the Holy Spirit , image = Holy Gh ...

* La Roche College *

Penn State Greater Allegheny Penn State Greater Allegheny (PSUGA) is a commonwealth campus of the Pennsylvania State University that sits on the border of McKeesport and White Oak The genus ''Quercus'' contains about 500 species, some of which are listed here. The genus, ...

* Pittsburgh Theological Seminary * Point Park University *

Reformed Presbyterian Theological Seminary The Reformed Presbyterian Theological Seminary (RPTS) is a Reformed Presbyterian seminary in Point Breeze, Pennsylvania. RPTS is a ministry of the Reformed Presbyterian Church of North America and was founded in 1810, making it the fifth old ...

Robert Morris University Robert Morris University (RMU) is a private university in Moon Township, Pennsylvania. It was founded in 1921 and is named after Robert Morris, known as the "financier of the mericanrevolution." It enrolls nearly 5,000 students and offers 60 ...

University of Pittsburgh The University of Pittsburgh (Pitt) is a public state-related research university in Pittsburgh, Pennsylvania. The university is composed of 17 undergraduate and graduate schools and colleges at its urban Pittsburgh campus, home to the univers ...

Community, junior and technical colleges

* Bidwell Training Center * Community College of Allegheny County *

Empire Beauty Schools Empire Beauty School is a large system of for-profit cosmetology schools in the United States. Headquartered in Pottsville, Pennsylvania, it is the largest system of cosmetology schools in the country. Founded in 1946, it currently has 76 sch ...

* Fountain of Youth Academy of Cosmetology * Institute of Medical and Business Careers * North Hills Beauty Academy * Pittsburgh Career Institute *

Pittsburgh Institute of Aeronautics The Pittsburgh Institute of Aeronautics (PIA) is a private trade school focused on aviation-related programs with its main location in West Mifflin, Pennsylvania. The institution's headquarters is at the Allegheny County Airport and it has thre ...

Pittsburgh Institute of Mortuary Science Pittsburgh Institute of Mortuary Science is a funeral service program based in the Shadyside neighborhood of Pittsburgh, Pennsylvania, United States. Notable alumni * James Huberty – Perpetrator of the San Ysidro McDonald's massacre The S ...

* Pittsburgh Multicultural Cosmetology Academy *

Pittsburgh Technical College Pittsburgh Technical College (PTC) is a private college in Pittsburgh, Pennsylvania. The college, formerly Pittsburgh Technical Institute, opened in 1946 and has since expanded with more than 30 career-focused programs in ten schools. Bachelor's ...

* Rosedale Technical College * South Hills Beauty Academy * Triangle Tech * Vet Tech Institute

Public school districts

Map of Allegheny County Pennsylvania School Districts

School districts include:

Approved private schools

These private schools provide special education for disabled students: * ACLD Tillotson School, Pittsburgh * The Day School at The Children's Institute, Pittsburgh * DePaul School for Hearing and Speech, Pittsburgh * Easter Seal Society of Western Pennsylvania * The Education Center at the Watson Institute, Sewickley * Pace School, Pittsburgh * Pressley Ridge Day School, Pittsburgh * Pressley Ridge School for the Deaf, Pittsburgh * The Watson Institute Friendship Academy, Pittsburgh * Wesley Spectrum Highland Services, Pittsburgh *

Western Pennsylvania School for Blind Children Western Pennsylvania School for Blind Children (WPSBC) is a private chartered school in Pittsburgh, Pennsylvania committed to nurturing the unique abilities of individuals with blindness and visual impairment. This multifaceted educational experie ...

, Pittsburgh * Western Pennsylvania School for the Deaf, Pittsburgh

Private high schools

Bishop Canevin High School Bishop Canevin High School is a Jesuit-inspired high school in Pittsburgh, Pennsylvania, United States. The school is located in the East Carnegie neighborhood of the city. History In 1958, Bishop John Dearden, Bishop of Pittsburgh, announce ...

* Central Catholic High School * Cornerstone Christian Preparatory Academy * Eden Christian Academy * The Ellis School * Hillcrest Christian Academy * Harvest Baptist Academy * Imani Christian Academy *

Oakland Catholic High School Oakland Catholic High School is a private, Roman Catholic college preparatory school for girls, located in the Oakland neighborhood of Pittsburgh, Pennsylvania, United States, within the Diocese of Pittsburgh. It was established by Bishop Donal ...

* Our Lady of the Sacred Heart High School *

Serra Catholic High School Serra Catholic High School is a private, college preparatory, Roman Catholic high school in McKeesport, Pennsylvania. It is located in the Roman Catholic Diocese of Pittsburgh. History Serra Catholic was established in September 1961 as an all-b ...

Seton-La Salle Catholic High School Seton LaSalle Catholic High School is a private, Roman Catholic high school in Mt. Lebanon, Pennsylvania, a suburb of Pittsburgh, Pennsylvania. It is located in the Roman Catholic Diocese of Pittsburgh. In 2016, under the direction of former ...

Sewickley Academy Sewickley Academy is a private, independent, coeducation, college-preparatory academy located in Sewickley, Pennsylvania in the United States. The Academy educates 594 students, from pre-kindergarten to twelfth grade. It is a member of the Nationa ...

* Shady Side Academy * St. Joseph High School *

Vincentian Academy Vincentian Academy was a Roman Catholic college preparatory school near Pittsburgh, Pennsylvania. It is located in the Roman Catholic Diocese of Pittsburgh. In February 2020 the Sisters of Charity of Nazareth announced the school would cease ope ...

* Winchester Thurston School

Transportation

Allegheny County's public transportation provider is

Pittsburgh Regional Transit Pittsburgh Regional Transit (PRT, formerly Port Authority of Allegheny County) is the second-largest public transit agency in Pennsylvania and the 20th-largest in the United States. The state-funded agency is based in Pittsburgh and is overseen ...

. The Allegheny County Department of Public Works oversees infrastructure, maintenance, and engineering services in the county. The Three Rivers Heritage Trail provides uninterrupted bicycle and pedestrian connections along the three rivers in the city, and the Great Allegheny Passage trail runs from downtown Pittsburgh to Washington, D.C. The Allegheny County Airport is the original airport for Pittsburgh and houses a number of flight schools, charter flight operations, and medevac operations.

Major roadways

Interstate 79 Interstate 79 (I-79) is an Interstate Highway in the eastern United States, designated from I-77 in Charleston, West Virginia, north to Pennsylvania Route 5 (PA 5) and PA 290 in Erie, Pennsylvania. It is a primary thoroughfar ...

runs north to south from Warrendale to Bridgeville * I-279 (PA)

Interstate 279 runs north to south from Franklin Park to Downtown * I-579 (PA)

Interstate 579 (Crosstown Boulevard), from Interstate 279 on the north shore to Liberty Bridge / Boulevard of the Allies * I-76 (PA)

Interstate 76 / PA Turnpike runs east to west from Interstate 376 in Monroeville to the Warrendale interchange (at

) *

Interstate 376 runs east to west from Interstate 76 in Monroeville across the county to Pittsburgh International Airport and beyond * Turnpike-576

Pennsylvania Turnpike 576 (future I-576) runs south from Interstate 376 at the Pittsburgh International Airport to US Route 22, also called the Findlay Connector. The next phase of this road extension, from US Route 22 to

running along the County line, is currently under construction and is expected to be open to traffic in 2020. * US 19

US Route 19 runs north to south from Warrendale to Upper St. Clair * US 22

US Route 22 runs west to east, along much of US Route 30 and Interstate 376, from

Imperial Imperial is that which relates to an empire, emperor, or imperialism. Imperial or The Imperial may also refer to: Places United States * Imperial, California * Imperial, Missouri * Imperial, Nebraska * Imperial, Pennsylvania * Imperial, Texas ...

to Monroeville * US 30

US Route 30 runs west to east from Clinton to North Versailles, joining

US 22 U.S. Route 22 (US 22) is a west–east route and is one of the original United States highways of 1926, running from Cincinnati, Ohio, at US 27, US 42, US 127, and US 52 to Newark, New Jersey, at U.S. Route 1/9 in the Newark Airport Interchang ...

and Interstate 376 south of the Pittsburgh International Airport and leaving those same two routes in

Wilkinsburg Wilkinsburg is a borough in Allegheny County, Pennsylvania. The borough has a population of 15,930 as of the 2010 census. Wilkinsburg is part of the Pittsburgh metropolitan area. The borough was named for John Wilkins Jr., a United States Army ...

For information about major state roads, see list of State Routes in Allegheny County, Pennsylvania and Allegheny County Belt System.

Parks and recreation

There are two Pennsylvania state parks in Allegheny County. Point State Park is at the

confluence In geography, a confluence (also: ''conflux'') occurs where two or more flowing bodies of water join to form a single channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main stem); o ...

of the Allegheny and Monongahela rivers in Downtown Pittsburgh, and

Allegheny Islands State Park Allegheny Islands State Park is a Pennsylvania state park in Harmar Township, Allegheny County, Pennsylvania in the United States. The undeveloped park is composed of three alluvial islands located in the middle of the Allegheny River northe ...

is in the

in Harmar Township and is undeveloped as of August 2010.

Pennsylvania State Game Lands Number 203 The Pennsylvania State Game Lands Number 203 are Pennsylvania State Game Lands located in Allegheny County, Pennsylvania in the United States. Geography The Game Lands consists of in two parcels located approximately northwest of Pittsburgh. T ...

is also located in Allegheny County providing hunting and other activities.

Sports

Pittsburgh Steelers The Pittsburgh Steelers are a professional American football team based in Pittsburgh. The Steelers compete in the National Football League (NFL) as a member club of the American Football Conference (AFC) North division. Founded in , the Steel ...

football Football is a family of team sports that involve, to varying degrees, kicking a ball to score a goal. Unqualified, the word ''football'' normally means the form of football that is the most popular where the word is used. Sports commonly ...

team *

Pittsburgh Penguins The Pittsburgh Penguins (colloquially known as the Pens) are a professional ice hockey team based in Pittsburgh. They compete in the National Hockey League (NHL) as a member of the Metropolitan Division of the Eastern Conference, and have playe ...

ice hockey Ice hockey (or simply hockey) is a team sport played on ice skates, usually on an ice skating rink with lines and markings specific to the sport. It belongs to a family of sports called hockey. In ice hockey, two opposing teams use ice ...

team *

Pittsburgh Pirates The Pittsburgh Pirates are an American professional baseball team based in Pittsburgh. The Pirates compete in Major League Baseball (MLB) as a member club of the National League (NL) Central division. Founded as part of the American Associati ...

baseball Baseball is a bat-and-ball sport played between two teams of nine players each, taking turns batting and fielding. The game occurs over the course of several plays, with each play generally beginning when a player on the fielding t ...

team * Pittsburgh Riverhounds,

soccer Association football, more commonly known as football or soccer, is a team sport played between two teams of 11 players who primarily use their feet to propel the ball around a rectangular field called a pitch. The objective of the game is ...

team * Pittsburgh Passion, Women's Football Alliance team *

Pittsburgh Thunderbirds The Pittsburgh Thunderbirds are a professional ultimate team that competes in the Central Division of the American Ultimate Disc League. In July 2015, the Thunderbirds reached the playoffs in their first year of existence and beat the Chicago Wil ...

, American Ultimate Disc League team *

Steel City Roller Derby Steel City Roller Derby or SCRD, is a women's flat-track roller derby league based in Pittsburgh, Pennsylvania. Founded in 2006, the league celebrated its tenth anniversary in 2016. Steel City is a member of the Women's Flat Track Derby Assoc ...

, Women's Flat Track Derby Association team

Communities

Map of Allegheny County Pennsylvania With Municipal and Township Labels

Under Pennsylvania law, there are four types of incorporated municipalities: cities,

boroughs A borough is an administrative division in various English-speaking countries. In principle, the term ''borough'' designates a self-governing walled town, although in practice, official use of the term varies widely. History In the Middle A ...

, townships, and (in one case) a

town A town is a human settlement. Towns are generally larger than villages and smaller than cities, though the criteria to distinguish between them vary considerably in different parts of the world. Origin and use The word "town" shares an o ...

. The following municipalities are in Allegheny County:

Cities

* Clairton * Duquesne * McKeesport *

(county seat)

Boroughs

* Aspinwall * Avalon * Baldwin * Bell Acres * Bellevue *

Ben Avon Ben Avon ( gd, Beinn Athfhinn, 'mountain of the Avon') is a mountain in the Cairngorms of Scotland. It is a sprawling mountain with a broad summit plateau dotted with granite tors. One of these marks the summit, called ''Leabaidh an Daimh Bhui ...

* Ben Avon Heights *

Bethel Park Bethel Park, officially the Municipality of Bethel Park, is a borough with home rule status in Allegheny County, Pennsylvania, United States. It is part of the Pittsburgh metropolitan area, located approximately southwest of Pittsburgh. The ...

* Blawnox * Brackenridge * Braddock * Braddock Hills * Bradford Woods * Brentwood * Bridgeville * Carnegie * Castle Shannon * Chalfant * Cheswick *

Churchill Sir Winston Leonard Spencer Churchill (30 November 187424 January 1965) was a British statesman, soldier, and writer who served as Prime Minister of the United Kingdom twice, from 1940 to 1945 during the Second World War, and again from 1 ...

Coraopolis Coraopolis () is a borough in Allegheny County, Pennsylvania. The population was 5,559 at the 2020 census. In 1940, the population peaked at 11,086. Coraopolis is located west of Pittsburgh along the Ohio River and to the east of the Pittsbur ...

* Crafton * Dormont * Dravosburg * East McKeesport *

East Pittsburgh East Pittsburgh is a borough in Allegheny County, Pennsylvania, about southeast of the confluence of the Monongahela and the Allegheny rivers at Pittsburgh. The population in 1900 stood at 2,883, and in 1910, at 5,615. As of the 2020 census, ...

* Edgewood * Edgeworth * Elizabeth * Emsworth * Etna * Forest Hills *

Fox Chapel Fox Chapel is a borough in Allegheny County, Pennsylvania, USA, and is an affluent suburb of Pittsburgh located northeast of downtown. The borough continually garners national prominence and is home to many of the wealthiest and most powerful ...

* Franklin Park * Glassport * Glen Osborne * Glenfield * Green Tree * Haysville *

Heidelberg Heidelberg (; Palatine German: ') is a city in the German state of Baden-Württemberg, situated on the river Neckar in south-west Germany. As of the 2016 census, its population was 159,914, of which roughly a quarter consisted of students ...

* Homestead * Ingram * Jefferson Hills * Leetsdale *

Liberty Liberty is the ability to do as one pleases, or a right or immunity enjoyed by prescription or by grant (i.e. privilege). It is a synonym for the word freedom. In modern politics, liberty is understood as the state of being free within society fr ...

* Lincoln * McDonald (mostly in Washington County) * McKees Rocks * Millvale * Monroeville * Mount Oliver * Munhall *

North Braddock North Braddock is a borough in Allegheny County, Pennsylvania, United States. North Braddock was organized from a part of Braddock Township in 1897. The borough prides itself in being the "Birth Place of Steel" as the home of Andrew Carnegie's ...

* Oakdale * Oakmont * Pennsbury Village *

Pitcairn The Pitcairn Islands (; Pitkern: '), officially the Pitcairn, Henderson, Ducie and Oeno Islands, is a group of four volcanic islands in the southern Pacific Ocean that form the sole British Overseas Territory in the Pacific Ocean. The four i ...

* Pleasant Hills *

Plum A plum is a fruit of some species in ''Prunus'' subg. ''Prunus'.'' Dried plums are called prunes. History Plums may have been one of the first fruits domesticated by humans. Three of the most abundantly cultivated species are not found ...

* Port Vue * Rankin * Rosslyn Farms * Sewickley *

Sewickley Heights Sewickley Heights is a borough in Allegheny County, Pennsylvania, United States. The population was 857 at the 2020 census. Sewickley Heights is one of the wealthiest municipalities in Pennsylvania and in the United States. History Sewickley ...

* Sewickley Hills * Sharpsburg * Springdale *

Swissvale Swissvale is a borough in Allegheny County, Pennsylvania, east of downtown Pittsburgh. Named for a farmstead owned by James Swisshelm, during the industrial age it was the site of the Union Switch and Signal Company of George Westinghouse. ...

Tarentum Tarentum may refer to: * Taranto, Apulia, Italy, on the site of the ancient Roman city of Tarentum (formerly the Greek colony of Taras) **See also History of Taranto * Tarentum (Campus Martius), also Terentum, an area in or on the edge of the Camp ...

* Thornburg *

Trafford Trafford is a metropolitan borough of Greater Manchester, England, with an estimated population of 235,493 in 2017. It covers Retrieved on 13 December 2007. and includes the area of Old Trafford and the towns of Altrincham, Stretford, Ur ...

(mostly in Westmoreland County) * Turtle Creek *

Verona Verona ( , ; vec, Verona or ) is a city on the Adige River in Veneto, Italy, with 258,031 inhabitants. It is one of the seven provincial capitals of the region. It is the largest city municipality in the region and the second largest in nor ...

Versailles The Palace of Versailles ( ; french: Château de Versailles ) is a former royal residence built by King Louis XIV located in Versailles, about west of Paris, France. The palace is owned by the French Republic and since 1995 has been managed, ...

Wall A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or, is decorative. There are many kinds of walls, including: * Walls in buildings that form a fundamental part of the s ...

* West Elizabeth *

West Homestead West Homestead is a borough in Allegheny County, Pennsylvania, southeast of Pittsburgh, on the Monongahela River. Heavy industries associated with nearby steel mills existed here. Established were axle works, brickworks, and manufactories of ma ...

* West Mifflin * West View *

Whitaker Whitaker (also Whittaker) is a surname of English and Scottish origin, meaning the white acre, also spelled " Whittaker" and " Whitacre." Notable people with the surname include: People with the name * The Whitaker iron family - a family importan ...

* White Oak *

Whitehall Whitehall is a road and area in the City of Westminster, Central London. The road forms the first part of the A3212 road from Trafalgar Square to Chelsea. It is the main thoroughfare running south from Trafalgar Square towards Parliament Sq ...

* Wilmerding

Townships

Aleppo )), is an adjective which means "white-colored mixed with black". , motto = , image_map = , mapsize = , map_caption = , image_map1 = ...

* Baldwin * Collier * Crescent * East Deer * Elizabeth *

Fawn Deer or true deer are hoofed ruminant mammals forming the family Cervidae. The two main groups of deer are the Cervinae, including the muntjac, the elk (wapiti), the red deer, and the fallow deer; and the Capreolinae, including the reindee ...

* Findlay * Forward * Frazer * Hampton * Harmar * Harrison *

Indiana Indiana () is a U.S. state in the Midwestern United States. It is the 38th-largest by area and the 17th-most populous of the 50 States. Its capital and largest city is Indianapolis. Indiana was admitted to the United States as the 19th ...

* Kennedy * Kilbuck *

Leet Leet (or "1337"), also known as eleet or leetspeak, is a system of modified spellings used primarily on the Internet. It often uses character replacements in ways that play on the similarity of their glyphs via reflection or other resemblance ...

* Marshall * McCandless *

Moon The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of ...

* Mt. Lebanon * Neville * North Fayette * North Versailles * O'Hara *

* Penn Hills *

Pine A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family (biology), family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanic ...

Reserve Reserve or reserves may refer to: Places * Reserve, Kansas, a US city * Reserve, Louisiana, a census-designated place in St. John the Baptist Parish * Reserve, Montana, a census-designated place in Sheridan County * Reserve, New Mexico, a US ...

* Richland * Robinson * Ross *

Scott Scott may refer to: Places Canada * Scott, Quebec, municipality in the Nouvelle-Beauce regional municipality in Quebec * Scott, Saskatchewan, a town in the Rural Municipality of Tramping Lake No. 380 * Rural Municipality of Scott No. 98, Sask ...

* Shaler *

South Fayette South Fayette Township is a township in Allegheny County, Pennsylvania, United States. The population was 14,416 at the 2010 census. History Throughout its early history, South Fayette Township was the site of numerous conflicts between the ea ...

South Park ''South Park'' is an American animated sitcom created by Trey Parker and Matt Stone and developed by Brian Graden for Comedy Central. The series revolves around four boysStan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormickand ...

* South Versailles * Springdale * Stowe * Upper Saint Clair * West Deer * Wilkins

Census-designated places

Census-designated place A census-designated place (CDP) is a concentration of population defined by the United States Census Bureau for statistical purposes only. CDPs have been used in each decennial census since 1980 as the counterparts of incorporated places, suc ...

s are geographical areas designated by the

US Census Bureau The United States Census Bureau (USCB), officially the Bureau of the Census, is a principal agency of the U.S. Federal Statistical System, responsible for producing data about the American people and economy. The Census Bureau is part of th ...

for the purposes of compiling demographic data. They are not actual jurisdictions under Pennsylvania law. Other unincorporated communities, such as villages, may be listed here as well. * Allison Park * Bairdford * Bakerstown *

Boston Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- mo ...

* Carnot-Moon * Clinton * Curtisville * Enlow * Gibsonia * Glenshaw *

Greenock Greenock (; sco, Greenock; gd, Grianaig, ) is a town and administrative centre in the Inverclyde council area in Scotland, United Kingdom and a former burgh within the historic county of Renfrewshire, located in the west central Lowland ...

* Harwick *

* Noblestown * Rennerdale * Russellton *

Sturgeon Sturgeon is the common name for the 27 species of fish belonging to the family Acipenseridae. The earliest sturgeon fossils date to the Late Cretaceous, and are descended from other, earlier acipenseriform fish, which date back to the Early ...

Unincorporated communities

* Acmetonia * Blackridge *

Blanchard Blanchard is a French family name. It is also used as a given name. It derives from the Old French word ''blanchart'' which meant "whitish, bordering upon white". It is also an obsolete term for a white horse. Geographical distribution As of 2014, ...

* Broughton * Bruceton *

Buena Vista Buena Vista, meaning "good view" in Spanish, may refer to: Places Canada *Bonavista, Newfoundland and Labrador, with the name being originally derived from “Buena Vista” *Buena Vista, Saskatchewan * Buena Vista, Saskatoon, a neighborhood in ...

* Creighton * Cubbage Hill * Cuddy * Dorseyville * Ewingsville * Harmarville * Indianola * Ingomar * Karns * Keown Station * Kirwan Heights *

Library A library is a collection of materials, books or media that are accessible for use and not just for display purposes. A library provides physical (hard copies) or digital access (soft copies) materials, and may be a physical location or a vi ...

* McKnight * Moon Run * Mount Vernon * Natrona * Natrona Heights * Nevillewood * Presto * Regent Square * Rural Ridge *

Sheraden Sheraden is a neighborhood that is located in the West End of Pittsburgh, Pennsylvania in the United States. Nearby neighborhoods include Windgap, Chartiers City, Crafton Heights, Esplen, and Elliott. History This neighborhood was named f ...

* Warrendale *

Wexford Wexford () is the county town of County Wexford, Ireland. Wexford lies on the south side of Wexford Harbour, the estuary of the River Slaney near the southeastern corner of the island of Ireland. The town is linked to Dublin by the M11/N11 ...

* Wildwood

Former places

Many political subdivisions of Allegheny County have come and gone through subdivision or annexation through the years. These include: * Allegheny City – the area that is now the North Shore (or North Side) of the City of Pittsburgh, north of the Allegheny River. * Allentown Borough – now the neighborhood of Allentown in Pittsburgh. * Birmingham Borough – what is now Pittsburgh's South Side. * Brushton Borough * Carrick Borough – now the neighborhood of Carrick. Formed out of Baldwin Township in 1904, this borough existed until it was annexed by Pittsburgh in 1927. It was named for Carrick-on-Suir, Ireland. Some of the area's manhole covers still bear the Carrick Borough name. * Chartier Township – existed at the time of the 1860 U.S. Federal Census. * Collins Township – in what is now the northeast part of the City of Pittsburgh, east of Lawrenceville and north of Penn Avenue. * Knoxville Borough * Lawrenceville Borough * McClure Township – McClure was formed in 1858 from the section of Ross Township adjacent to Allegheny City. In 1867 McClure, along with sections of Reserve Township, was incorporated into Allegheny City. The McClure section of this annexation became Wards 9 (Woods Run Area) and 11 (present-day Brighton Heights) in the City of Pittsburgh. * Mifflin Township- comprised the modern day communities of Whitaker, West Mifflin, West Homestead, West Elizabeth, Pleasant Hills, Munhall, Lincoln Place, Jefferson Hills, Homestead, Hays, Duquesne, Dravosburg, Clairton and part of Baldwin. * Patton Township – was in the east-central part of the county, north of North Versailles Township, east of Wilkins and Penn Townships, and south of Plum Township. In the U.S. census for 1860–1880. In 1951 it became incorporated as the borough of Monroeville. * Northern Liberties Borough – in what is now the Strip District of Pittsburgh. The borough was annexed to Pittsburgh in 1837 as the first addition to the city's original territory. * Peebles Township – included most of what is now the eastern part of the city of Pittsburgh from the Monongahela River in the south (today's Hazelwood) to the Allegheny River in the north. It was subdivided into Collins and

townships, all of which were incorporated into Pittsburgh in 1868. * Pitt Township * St. Clair Township – stretched from the Monongahela River south to the Washington County line. It divided into Lower St. Clair, which eventually became part of the City of Pittsburgh, Dormont, Mount Lebanon, and Upper St. Clair. * Snowden – now known as South Park Township. * Sterrett Township * Temperanceville – what is now Pittsburgh's West End. * Union Borough – the area surrounding Temperanceville. * West Liberty Borough – now the neighborhoods of Brookline and Beechview in Pittsburgh.

Population ranking

The population ranking of the following table is based on the 2010 census of Allegheny County. † ''county seat''

Notes

References

External links

Allegheny County official website

Allegheny County Quest

County Map by Municipality

Historic Pittsburgh Map Collection

Southwestern Pennsylvania Commission
{{coord, 40.47, -79.98, display=title, type:adm2nd_region:US-PA_source:UScensus1990 Pennsylvania counties on the Ohio River Pittsburgh metropolitan area 1788 establishments in Pennsylvania Populated places established in 1788 Counties of Appalachia Pennsylvania placenames of Native American origin