Area codes 815 and 779 are telephone

area code A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, rea ...

s in the

North American Numbering Plan The North American Numbering Plan (NANP) is an integrated telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1, World Numbering Zone ...

(NANP) for most of

northern Illinois Northern Illinois is a region generally covering the northern third of the U.S. state of Illinois. The region is by far the most populous of Illinois, with nearly 9.7 million residents as of 2010. Economics Northern Illinois is dominated by ...

outside the

Quad Cities The Quad Cities is a region of five cities (originally Tri-Cities, later four, see #History, History) in the U.S. states of Iowa and Illinois: Davenport, Iowa, Davenport and Bettendorf, Iowa, Bettendorf (the fifth to be included) in southeaster ...

areas. It also serves the Joliet area and some of Chicago’s western and northwestern suburbs. 815 was one of the four original Illinois area codes set up in 1947. Area code 779 was assigned to the same numbering plan area in 2009 to form an overlay.

History

When the

American Telephone and Telegraph Company AT&T Corporation, an abbreviation for its former name, the American Telephone and Telegraph Company, was an American telecommunications company that provided voice, video, data, and Internet telecommunications and professional services to busi ...

(AT&T) created the first nationwide

telephone numbering plan A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, reach ...

for

Operator Toll Dialing Operator Toll Dialing was a telephone call routing and toll-switching system for the Bell System and the independent telephone companies in the United States and Canada that paved the way for Direct Distance Dialing (DDD) by telephone service subsc ...

in 1947, the state of Illinois was divided into four numbering plan areas (NPAs). They were generally laid out as a region in and around Chicago, a northern band outside Chicago, and two bands in the central and southern parts of the state. 815 was assigned to the northern band outside Chicago as one of the 86

original North American area codes The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947. The assignment was in accord with the design of a uniform nationwide telephone numbering plan that supported the goal of dialin ...

. After September 1956, the 815 numbering plan area was divided roughly in half along a north-westerly to south-easterly running line. Area code 309 was created by merging the western part of 815, including the Illinois side of the Quad Cities, with the northern portion of

area code 217 Area codes 217 and 447 are telephone area codes in the North American Numbering Plan (NANP) for much of the central part of the U.S. state of Illinois. The numbering plan area (NPA) includes the state capital, Springfield, and Champaign, Ur ...

. The new area code was one of the first area codes not serving an entire state, but having the digit ''0'' in the middle position of the code. It was the only new area code created in Illinois between 1947 and the 1989 creation of

area code 708 Area codes 708 and 464 are telephone area codes in the North American Numbering Plan (NANP) for the southern and western suburbs of Chicago in the U.S. state of Illinois. The numbering plan area comprises most of western and southern Cook County ...

.History of area code 309
/ref> In preparation of an

overlay plan In telecommunications, an area code overlay complex is a telephone numbering plan that assigns multiple area codes to the same geographic numbering plan area (NPA). Area code overlays are implemented in territories of the North American Numbe ...

with the new area code 779, all calls from the 815 area needed to be dialed with an area code beginning on February 17, 2007. A month later, area code 779 was activated.

Service area

Adeline Adeline may refer to: People *Adeline (given name) *Yves-Marie Adeline (born 1960), French Catholic writer Places *Adeline, Illinois, village in Maryland Township, Ogle County, Illinois, US Arts and entertainment *Adeline Records, recording lab ...

* Amboy * Andres * Apple River * Argyle * Aroma Park * Ashkum * Ashton * Baileyville * Ballou * Belvidere * Bonfield *

Bourbonnais The Bourbonnais (; Occitan language, Occitan: ''Borbonés'') was a Provinces of France, historic province in the centre of France that corresponds to the modern ''département in France, département'' of Allier, along with part of the ''dépar ...

* Braceville * Bradley * Braidwood * Brush Point *

Buckingham Buckingham ( ) is a market town in north Buckinghamshire, England, close to the borders of Northamptonshire and Oxfordshire, which had a population of 12,890 at the United Kingdom Census 2011, 2011 Census. The town lies approximately west of ...

* Buffalo Grove * Bull Valley *

Byron George Gordon Byron, 6th Baron Byron (22 January 1788 – 19 April 1824) was an English poet. He is one of the major figures of the Romantic movement, and is regarded as being among the greatest poets of the United Kingdom. Among his best-kno ...

Caledonia Caledonia (; ) was the Latin name used by the Roman Empire to refer to the forested region in the central and western Scottish Highlands, particularly stretching through parts of what are now Lochaber, Badenoch, Strathspey, and possibly as ...

* Capron * Carbon Hill *

Cedar Point Cedar Point is a amusement park located on a Lake Erie peninsula in Sandusky, Ohio, United States, owned and operated by Six Flags. It opened in 1870 and is considered the second-oldest operating amusement park in the US behind Lake Compounc ...

* Cedarville * Chadwick * Chana * Channahon * Cherry Valley * Clifton * Coal City * Coleta * Coltonville * Compton *

Coral Corals are colonial marine invertebrates within the subphylum Anthozoa of the phylum Cnidaria. They typically form compact Colony (biology), colonies of many identical individual polyp (zoology), polyps. Coral species include the important Coral ...

* Cortland * Crest Hill * Creston * Crystal Lake * Crystal Lawns * Dakota * Dana * Danforth * Davis * Davis Junction * Daysville * Deer Grove * DeKalb *

Diamond Diamond is a Allotropes of carbon, solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Diamond is tasteless, odourless, strong, brittle solid, colourless in pure form, a poor conductor of e ...

* Dixon * Durand * Dwight * Earlville * East Brooklyn * East Dubuque * Egan * Eleroy * Elizabeth * Elwood * Esmond *

Essex Essex ( ) is a Ceremonial counties of England, ceremonial county in the East of England, and one of the home counties. It is bordered by Cambridgeshire and Suffolk to the north, the North Sea to the east, Kent across the Thames Estuary to the ...

* Fairdale * Fairmont * Flagg Center * Forreston * Frankfort * Frankfort Square * Franklin Grove * Freeport * Fulton *

Galena Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). It is the most important ore of lead and an important source of silver. Galena is one of the most abundant and widely distributed sulfide minerals. It crysta ...

Genoa Genoa ( ; ; ) is a city in and the capital of the Italian region of Liguria, and the sixth-largest city in Italy. As of 2025, 563,947 people live within the city's administrative limits. While its metropolitan city has 818,651 inhabitan ...

* Garden Prairie * Gardner * German Valley * Gilman * Godley * Grand Detour * Grand Ridge * Grant Park * Granville * Greenwood * Haldane *

Hanover Hanover ( ; ; ) is the capital and largest city of the States of Germany, German state of Lower Saxony. Its population of 535,932 (2021) makes it the List of cities in Germany by population, 13th-largest city in Germany as well as the fourth-l ...

* Harmon * Harrison *

Harvard Harvard University is a private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of higher lear ...

Hebron Hebron (; , or ; , ) is a Palestinian city in the southern West Bank, south of Jerusalem. Hebron is capital of the Hebron Governorate, the largest Governorates of Palestine, governorate in the West Bank. With a population of 201,063 in ...

* Herscher * Holiday Hills * Homer Glen * Hillcrest *

Hinckley Hinckley is a market town in south-west Leicestershire, England, administered by Hinckley and Bosworth Borough Council. Hinckley is the third largest settlement in Leicestershire, after Leicester and Loughborough, and is about halfway between L ...

* Hopkins Park * Ingalls Park * Irwin * Johnsburg * Joliet * Kangley * Kankakee *

Kent Kent is a Ceremonial counties of England, ceremonial county in South East England. It is bordered by Essex across the Thames Estuary to the north, the Strait of Dover to the south-east, East Sussex to the south-west, Surrey to the west, and Gr ...

* Kings * Kingston * Kinsman * Kirkland * Lake Holiday * Lake Summerset * Lakemoor * Lakewood * Lakewood Shores *

Lanark Lanark ( ; ; ) is a town in South Lanarkshire, Scotland, located 20 kilometres to the south-east of Hamilton, South Lanarkshire, Hamilton. The town lies on the River Clyde, at its confluence with Mouse Water. In 2016, the town had a populatio ...

* LaSalle * Leaf River * Lee * Leland * Lena * Leonore * Lindenwood *

Lisbon Lisbon ( ; ) is the capital and largest city of Portugal, with an estimated population of 567,131, as of 2023, within its administrative limits and 3,028,000 within the Lisbon Metropolitan Area, metropolis, as of 2025. Lisbon is mainlan ...

* Lockport * Lostant * Loves Park *

Lyndon Lyndon may refer to: Places * Lyndon, Alberta, Canada * Lyndon, Rutland, East Midlands, England * Lyndon, Solihull, West Midlands, England United States * Lyndon, Illinois * Lyndon, Kansas * Lyndon, Kentucky * Lyndon, New York * Lyndon, Ohio * L ...

* Machesney Park *

Malta Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...

Manhattan Manhattan ( ) is the most densely populated and geographically smallest of the Boroughs of New York City, five boroughs of New York City. Coextensive with New York County, Manhattan is the County statistics of the United States#Smallest, larg ...

* Manteno * Maple Park * Marengo *

Marseilles Marseille (; ; see below) is a city in southern France, the prefecture of the department of Bouches-du-Rhône and of the Provence-Alpes-Côte d'Azur region. Situated in the Provence region, it is located on the coast of the Mediterranean S ...

Mazon Mazon may refer to: Places in the United States * Mazon, Illinois, a village * Mazon Creek fossils * Mazon River * Mazon station, Mazon, Illinois * Mazon Township, Grundy County, Illinois Organizations *MAZON: A Jewish Response to Hunger, a nonpro ...

* McCullom Lake * McHenry * Mendota *

Menominee The Menominee ( ; meaning ''"Menominee People"'', also spelled Menomini, derived from the Ojibwe language word for "Wild Rice People"; known as ''Mamaceqtaw'', "the people", in the Menominee language) are a federally recognized tribe of Na ...

* Meriden * Millbrook * Milledgeville * Millington * Minooka * Mokena * Momence * Monee * Monroe Center * Morris *

Morrison Morrison may refer to: People * Morrison (surname), people with the Scottish surname Morrison * Morrison Heady (1829–1915), American poet * Morrison Mann MacBride (1877–1938), Canadian merchant Places in the United States * Morrison, Colorad ...

* Mount Carroll * Mount Morris * Naplate *

Nelson Nelson may refer to: Arts and entertainment * ''Nelson'' (1918 film), a historical film directed by Maurice Elvey * ''Nelson'' (1926 film), a historical film directed by Walter Summers * ''Nelson'' (opera), an opera by Lennox Berkeley to a lib ...

* New Milford * New Lenox * Newark * Nora * North Utica *

Norway Norway, officially the Kingdom of Norway, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of the Kingdom of ...

* Odell * Oglesby * Onarga * Oneco * Orangeville *

Oregon Oregon ( , ) is a U.S. state, state in the Pacific Northwest region of the United States. It is a part of the Western U.S., with the Columbia River delineating much of Oregon's northern boundary with Washington (state), Washington, while t ...

Ottawa Ottawa is the capital city of Canada. It is located in the southern Ontario, southern portion of the province of Ontario, at the confluence of the Ottawa River and the Rideau River. Ottawa borders Gatineau, Gatineau, Quebec, and forms the cor ...

* Paw Paw * Paynes Point * Pearl City * Pecatonica * Peotone *

Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...

* Plainfield *

Polo Polo is a stick and ball game that is played on horseback as a traditional field sport. It is one of the world's oldest known team sports, having been adopted in the Western world from the game of Chovgan (), which originated in ancient ...

* Pontiac * Poplar Grove * Prairie Grove * Preston Heights * Princeton * Prophetstown *

Ransom Ransom refers to the practice of holding a prisoner or item to extort money or property to secure their release. It also refers to the sum of money paid by the other party to secure a captive's freedom. When ransom means "payment", the word ...

* Reddick * Richmond * Ridott * Ringwood * Ritchie * Rochelle * Rock City * Rock Falls * Rockdale * Rockford * Rockton * Rodden * Romeoville * Roscoe *

Rutland Rutland is a ceremonial county in the East Midlands of England. It borders Leicestershire to the north and west, Lincolnshire to the north-east, and Northamptonshire to the south-west. Oakham is the largest town and county town. Rutland has a ...

St. Anne According to apocrypha, as well as Christian and Islamic tradition, Saint Anne was the mother of Mary, the wife of Joachim and the maternal grandmother of Jesus. Mary's mother is not named in the Bible's canonical gospels. In writing, Anne's na ...

Sandwich A sandwich is a Dish (food), dish typically consisting variously of meat, cheese, sauces, and vegetables used as a filling between slices of bread, or placed atop a slice of bread; or, more generally, any dish in which bread serves as a ''co ...

Savanna A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) biome and ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach th ...

* Scales Mound * Seneca * Serena * Seward * Shabbona * Shannon * Sheridan * Shirland * Shorewood * Somonauk * South Beloit * South Wilmington * Spring Grove * Spring Valley * Sterling * Steward * Stillman Valley * Stockton * Streator * Sublette * Sun River Terrace *

Sycamore Sycamore is a name which has been applied to several types of trees, but with somewhat similar leaf forms. The name derives from the Ancient Greek () meaning . Species of otherwise unrelated trees known as sycamore: * ''Acer pseudoplatanus'', a ...

* Symerton *

Tampico Tampico is a city and port in the southeastern part of the Mexican state of Tamaulipas. It is located on the north bank of the Pánuco River, about inland from the Gulf of Mexico, and directly north of the state of Veracruz. Tampico is the fif ...

* Thomson * Timberlane *

Toluca Toluca , officially Toluca de Lerdo , is the States of Mexico, state capital of the State of Mexico as well as the seat of the Municipality of Toluca. Toluca has a population of 910,608 as of the 2020 census. The city forms the core of the Grea ...

* Tonica * Triumph * Troy Grove * Union * Union Hill *

Verona Verona ( ; ; or ) is a city on the Adige, River Adige in Veneto, Italy, with 255,131 inhabitants. It is one of the seven provincial capitals of the region, and is the largest city Comune, municipality in the region and in Northeast Italy, nor ...

* Waddams Grove *

Walnut A walnut is the edible seed of any tree of the genus '' Juglans'' (family Juglandaceae), particularly the Persian or English walnut, '' Juglans regia''. They are accessory fruit because the outer covering of the fruit is technically an i ...

* Warren * Waterman * Watseka * West Brooklyn * Wenona * Wilmington * Wilton * Wilton Center * Winnebago * Winslow * Wonder Lake * Wonder Lake (CDP) *

Woodstock The Woodstock Music and Art Fair, commonly referred to as Woodstock, was a music festival held from August 15 to 18, 1969, on Max Yasgur's dairy farm in Bethel, New York, southwest of the town of Woodstock, New York, Woodstock. Billed as "a ...

* Woosung

References

External links

Area Code Overlay Approved for 815 Area Code
- general information from

AT&T AT&T Inc., an abbreviation for its predecessor's former name, the American Telephone and Telegraph Company, is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the w ...

, the

RBOC A Regional Bell Operating Company (RBOC) was a corporate entity created as result of the antitrust lawsuit by the United States Department of Justice against the Western Electric Company and American Telephone and Telegraph Company (AT&T) in 1 ...

for the area code {{Coord, 40.195659, N, 89.516602, W, region:US-IL, display=title Telecommunications-related introductions in 1947 Telecommunications-related introductions in 2007 815 and 779 815 and 779

History

Service area

See also

References

External links