Area codes 203 and 475 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 the southwestern part of the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...

Connecticut Connecticut ( ) is a U.S. state, state in the New England region of the Northeastern United States. It borders Rhode Island to the east, Massachusetts to the north, New York (state), New York to the west, and Long Island Sound to the south. ...

. The numbering plan area (NPA) is mostly coextensive with the Connecticut portion of the

New York metropolitan area The New York metropolitan area, also called the Tri-State area and sometimes referred to as Greater New York, is the List of cities by GDP, largest metropolitan economy in the world, with a List of U.S. metropolitan areas by GDP, gross metropo ...

, and comprises most of

Fairfield County Fairfield County is the name of three counties in the United States: * Fairfield County, Connecticut * Fairfield County, Ohio * Fairfield County, South Carolina {{Geodis, uscounty ...

, all of

New Haven County New Haven County is a county in the south central part of the U.S. state of Connecticut. As of the 2020 census, the population was 864,835, making it the third-most populous county in Connecticut. Two of the state's five largest cities, New Ha ...

, and a small portion of Litchfield County. 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) established the first nationwide

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 ...

in 1947, Connecticut received only a single area code, 203, 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 ...

. On August 28, 1995 the state was divided into two NPAs, reducing the area of 203 to today's extent and adding

area code 860 Area codes 860 and 959 are telephone area codes in the North American Numbering Plan in the U.S. state of Connecticut. They are arranged in an overlay plan that covers most of the state, except its southwest, which uses area codes 203 and 475. Ar ...

for the region outside. Area code 860 was eventually overlaid with 959, and NPA 203 received a second area code when 475 was added on December 12, 2009. This overlay was first proposed by the Connecticut Department of Public Utility Control in August 1999. Even though area code 475 overlays only 203, all callers in Connecticut (including those in area code 860) had to dial all calls with ten digits, effective November 14, 2009;
Planning Letter 388
' NANPA, April 14, 2009 this was in preparation for the overlay of

area code 959 Area is the Measure (mathematics), measure of a Domain (mathematical analysis), region's size on a surface (mathematics), surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while ''surface are ...

that was implemented in 2014. The first range of telephone numbers made available in Connecticut's third area code was (475) 882-4xxx, in the Huntington section of

Shelton Shelton may refer to: Places United Kingdom *Shelton, North Bedfordshire, in the parish of Dean and Shelton, Bedfordshire * Lower Shelton, in the parish of Marston Moretaine, Bedfordshire * Upper Shelton, in the parish of Marston Moretaine, Bedf ...

Service area

The counties included in the numbering plan area are: : Fairfield (except the Town of

Sherman Sherman most commonly refers to: *Sherman (name), including a list of people and fictional characters with the given name or surname ** William Tecumseh Sherman (1820–1891), American Civil War General *M4 Sherman, a World War II American tank S ...

New Haven New Haven is a city of the U.S. state of Connecticut. It is located on New Haven Harbor on the northern shore of Long Island Sound. With a population of 135,081 as determined by the 2020 U.S. census, New Haven is the third largest city in Co ...

, and Litchfield (the towns of Woodbury,

Bethlehem Bethlehem is a city in the West Bank, Palestine, located about south of Jerusalem, and the capital of the Bethlehem Governorate. It had a population of people, as of . The city's economy is strongly linked to Tourism in the State of Palesti ...

, and a small part of Roxbury). This serves the following cities and towns: : Ansonia,

Beacon Falls Beacon Falls is a town in western New Haven County, Connecticut, United States. The town is part of the Naugatuck Valley Planning Region and is approximately six miles from Waterbury. It lies in the southwestern part of the state, and is bisect ...

Bethany Bethany (,Murphy-O'Connor, 2008, p152/ref> Syriac language, Syriac: ܒܝܬ ܥܢܝܐ ''Bēṯ ʿAnyā''), locally called in Palestinian Arabic, Arabic Al-Eizariya or al-Aizariya (, "Arabic nouns and adjectives#Nisba,

lace Lace is a delicate fabric made of yarn or thread in an open weblike pattern, made by machine or by hand. Generally, lace is split into two main categories, needlelace and bobbin lace, although there are other types of lace, such as knitted o ...

of Lazarus (name), L ...

Bethel Bethel (, "House of El" or "House of God",Bleeker and Widegren, 1988, p. 257. also transliterated ''Beth El'', ''Beth-El'', ''Beit El''; ; ) was an ancient Israelite city and sacred space that is frequently mentioned in the Hebrew Bible. Bet ...

, Branford,

Bridgeport Bridgeport is the most populous city in the U.S. state of Connecticut and the fifth-most populous city in New England, with a population of 148,654 in 2020. Located in eastern Fairfield County at the mouth of the Pequonnock River on Long Is ...

, Brookfield,

Cheshire Cheshire ( ) is a Ceremonial counties of England, ceremonial county in North West England. It is bordered by Merseyside to the north-west, Greater Manchester to the north-east, Derbyshire to the east, Staffordshire to the south-east, and Shrop ...

Danbury Danbury ( ) is a city in Fairfield County, Connecticut, United States, located approximately northeast of New York City. Danbury's population as of 2020 was 86,518. It is the third-largest city in Western Connecticut, and the seventh-largest ...

, Darien,

Derby Derby ( ) is a City status in the United Kingdom, city and Unitary authorities of England, unitary authority area on the River Derwent, Derbyshire, River Derwent in Derbyshire, England. Derbyshire is named after Derby, which was its original co ...

, East Haven, Easton, Fairfield,

Greenwich Greenwich ( , , ) is an List of areas of London, area in south-east London, England, within the Ceremonial counties of England, ceremonial county of Greater London, east-south-east of Charing Cross. Greenwich is notable for its maritime hi ...

, Guilford, Hamden,

Madison Madison may refer to: People * Madison (name), a given name and a surname * James Madison (1751–1836), fourth president of the United States * Madison (footballer), Brazilian footballer Places in the United States Populated places * Madi ...

, Meriden, Middlebury,

Milford Milford may refer to: Place names Canada * Milford (Annapolis), Nova Scotia * Milford (Halifax), Nova Scotia * Milford, Ontario England * Milford, Derbyshire * Milford, Devon, a place in Devon * Milford on Sea, Hampshire * Milford, Shro ...

Monroe Monroe or Monroes may refer to: People and fictional characters * Monroe (surname) * Monroe (given name) * James Monroe, 5th President of the United States * Marilyn Monroe, actress and model Places United States * Monroe, Arkansas, an unincorp ...

Naugatuck Naugatuck ( ) is a consolidated borough and town in New Haven County, Connecticut, United States. The town, part of the Naugatuck Valley Planning Region, had a population of 31,519 as of the 2020 Census. The town spans both sides of the Naug ...

New Canaan New Canaan () is a town in Fairfield County, Connecticut, United States. The population was 20,622 according to the 2020 census. The town is part of the Western Connecticut Planning Region. About an hour from New York City by train, the town ...

New Fairfield New Fairfield is a New England town, town in Fairfield County, Connecticut, United States. The population was 13,579 at the 2020 United States census, 2020 census. New Fairfield is one of five towns that surround Candlewood Lake, the largest l ...

, Newtown, North Branford, North Haven, Norwalk,

Orange Orange most often refers to: *Orange (fruit), the fruit of the tree species '' Citrus'' × ''sinensis'' ** Orange blossom, its fragrant flower ** Orange juice *Orange (colour), the color of an orange fruit, occurs between red and yellow in the vi ...

Oxford Oxford () is a City status in the United Kingdom, cathedral city and non-metropolitan district in Oxfordshire, England, of which it is the county town. The city is home to the University of Oxford, the List of oldest universities in continuou ...

Prospect Prospect may refer to: General * Prospect (marketing), a marketing term describing a potential customer * Prospect (sports), any player whose rights are owned by a professional team, but who has yet to play a game for the team * Prospect (minin ...

, Redding, Ridgefield, a small part of Roxbury,

Seymour Seymour may refer to: Places Australia *Seymour, Victoria, a township ** Seymour railway station * Electoral district of Seymour, a former electoral district in Victoria * Rural City of Seymour, a former local government area in Victoria * Se ...

, Southbury, Stamford, Stratford, Trumbull, Wallingford,

Waterbury Waterbury is a city in the U.S. state of Connecticut. Waterbury had a population of 114,403 as of the 2020 United States census, 2020 Census. The city is southwest of Hartford, Connecticut, Hartford and northeast of New York City. Waterbury i ...

West Haven West Haven is a city in New Haven County, Connecticut, United States, located on the coast of Long Island Sound. The city is part of the South Central Connecticut Planning Region. At the 2020 census, the population of the city was 55,584. Hi ...

Weston Weston may refer to: Places Australia * Weston, Australian Capital Territory, a suburb of Canberra * Weston, New South Wales * Weston Creek, a residential district of Canberra * Weston Park, Canberra, a park Canada * Weston, Nova Scotia * W ...

, Westport, Wilton, Wolcott, Woodbridge, Woodbury The city of Meriden is notable as the only place in Connecticut from where one can call towns in either the Hartford or New Haven exchanges toll-free from a landline telephone.

References

External links

Connecticut Department of Public Utility Control
{{Area code box, State=CT , This=Area codes 203 and 475 , N= 860, 959 , S= 516/363, 631/934 , E= 860, 959 , W=

914 __NOTOC__ Year 914 ( CMXIV) was a common year starting on Saturday of the Julian calendar. Events By place Byzantine Empire * Spring – Empress Zoe Karbonopsina leads a palace coup at Constantinople and, with the support of the '' ma ...

, 845/329 , S1=NY Telecommunications-related introductions in 1947 Telecommunications-related introductions in 2009

203 Year 203 ( CCIII) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Plautianus and Geta (or, less frequently, year 956 ''Ab urbe condita''). The denomination 203 for this ye ...

Fairfield County, Connecticut New Haven County, Connecticut Litchfield County, Connecticut

Service area

See also

References

External links