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, re ...

s in the

North American Numbering Plan The North American Numbering Plan (NANP) is a 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 and has the international calling ...

(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 sove ...

Connecticut Connecticut () is the southernmost state in the New England region of the Northeastern United States. It is bordered by Rhode Island to the east, Massachusetts to the north, New York to the west, and Long Island Sound to the south. Its cap ...

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

New York metropolitan area The New York metropolitan area, also commonly referred to as the Tri-State area, is the largest metropolitan area in the world by urban landmass, at , and one of the most populous urban agglomerations in the world. The vast metropolitan area ...

, and comprises most of Fairfield County, 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 top 5 largest cities, ...

, and a small portion of Litchfield County. When the

American Telephone and Telegraph Company AT&T Inc. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company by revenue and the third largest provider of mobile tel ...

(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, rea ...

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 & Telegraph Company (AT&T) in 1947, following the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speedi ...

. 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 is the quantity that expresses the extent of a region on the plane or on a curved surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while ''surface area'' refers to the area of an ope ...

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 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. ...

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, Bed ...

Service area

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

Sherman Sherman most commonly refers to: *Sherman (name), a surname and given name (and list of persons with the name) ** William Tecumseh Sherman (1820–1891), American Civil War General *M4 Sherman, a tank Sherman may also refer to: Places United St ...

New Haven New Haven is a city in the U.S. state of Connecticut. It is located on New Haven Harbor on the northern shore of Long Island Sound in New Haven County, Connecticut and is part of the New York City metropolitan area. With a population of 134,023 ...

, and Litchfield (the towns of Woodbury,

Bethlehem Bethlehem (; ar, بيت لحم ; he, בֵּית לֶחֶם '' '') is a city in the central West Bank, Palestine, about south of Jerusalem. Its population is approximately 25,000,Amara, 1999p. 18.Brynen, 2000p. 202. and it is the capital ...

, and a small part of

Roxbury Roxbury may refer to: Places ;Canada * Roxbury, Nova Scotia * Roxbury, Prince Edward Island ;United States * Roxbury, Connecticut * Roxbury, Kansas * Roxbury, Maine * Roxbury, Boston, a municipality that was later integrated into the city of Bosto ...

). This serves the following cities and towns: : Ansonia,

Beacon Falls Beacon Falls is a town in western New Haven County, Connecticut, United States. It lies in the southwestern part of the state, and is bisected by the Naugatuck River. The population was 6,000 at the 2020 census, down from 6,049 at the 2010 ...

Bethany Bethany ( grc-gre, Βηθανία,Murphy-O'Connor, 2008, p152/ref> Syriac: ܒܝܬ ܥܢܝܐ ''Bēṯ ʿAnyā'') or what is locally known as Al-Eizariya or al-Azariya ( ar, العيزرية, " laceof Lazarus"), is a Palestinian town in the West ...

Bethel Bethel ( he, בֵּית אֵל, translit=Bēṯ 'Ēl, "House of El" or "House of God",Bleeker and Widegren, 1988, p. 257. also transliterated ''Beth El'', ''Beth-El'', ''Beit El''; el, Βαιθήλ; la, Bethel) was an ancient Israelite san ...

, Branford,

Bridgeport Bridgeport is the List of municipalities in Connecticut, most populous city and a major port in the U.S. state of Connecticut. With a population of 148,654 in 2020, it is also the List of cities by population in New England, fifth-most populous ...

Brookfield Brookfield may refer to: Australia *Brookfield, Queensland, a suburb of Brisbane *Brookfield, Victoria Canada * Brookfield, Manitoba, on Manitoba Highway 11 *Brookfield, Newfoundland and Labrador *Brookfield, Nova Scotia *Brookfield, Ontario ...

Cheshire Cheshire ( ) is a ceremonial and historic county in North West England, bordered by Wales to the west, Merseyside and Greater Manchester to the north, Derbyshire to the east, and Staffordshire and Shropshire to the south. Cheshire's coun ...

, Danbury, Darien,

Derby Derby ( ) is a city and unitary authority area in Derbyshire, England. It lies on the banks of the River Derwent in the south of Derbyshire, which is in the East Midlands Region. It was traditionally the county town of Derbyshire. Derby gain ...

, East Haven, Easton, Fairfield,

Greenwich Greenwich ( , ,) is a town in south-east London, England, within the ceremonial county of Greater London. It is situated east-southeast of Charing Cross. Greenwich is notable for its maritime history and for giving its name to the Greenwic ...

Guilford Guildford is a town in Surrey, England. It gives its name to the Borough of Guildford, the Diocese of Guildford and the Guildford (UK Parliament constituency), Parliamentary constituency of Guildford. Guildford, Guilford, or Gildford may also refe ...

, 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 Place names * Madison, Wisconsin, the state capital of Wisconsin and the largest city known by this ...

, Meriden, Middlebury, Milford, Monroe,

Naugatuck Naugatuck is a consolidated borough and town in New Haven County, Connecticut, United States. The town spans both sides of the Naugatuck River just south of Waterbury and includes the communities of Union City on the east side of the river, which ...

New Canaan New Canaan () is a town in Fairfield County, Connecticut, United States. The population was 20,622 according to the 2020 census. About an hour from Manhattan by train, the town is considered part of Connecticut's Gold Coast. The town is bounde ...

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

, 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 (colour), from the color of an orange, occurs between red and yellow in the visible spectrum ...

Oxford Oxford () is a city in England. It is the county town and only city of Oxfordshire. In 2020, its population was estimated at 151,584. It is north-west of London, south-east of Birmingham and north-east of Bristol. The city is home to the Un ...

, Prospect, Redding, Ridgefield, a small part of

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

Southbury Southbury is a town in western New Haven County, Connecticut, United States. Southbury is north of Oxford and Newtown, and east of Brookfield. Its population was 19,879 at the 2020 census. Southbury comprises sprawling rural country areas, ...

, Stamford, Stratford, Trumbull, Wallingford,

Waterbury Waterbury is a city in the U.S. state of Connecticut on the Naugatuck River, southwest of Hartford and northeast of New York City. Waterbury is the second-largest city in New Haven County, Connecticut. According to the 2020 US Census, in 20 ...

West Haven West or Occident is one of the four cardinal directions or points of the compass. It is the opposite direction from east and is the direction in which the Sun sets on the Earth. Etymology The word "west" is a Germanic word passed into some R ...

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 * ...

, 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 __NOTOC__ Year 860 ( DCCCLX) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire * June 18 – Byzantine–Rus' War: A fleet of about 200 Rus' vessel ...

959 Year 959 ( CMLIX) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire * April - May – The Byzantines refuse to pay the yearly tribute. A Hungar ...

, S=

516 Year 516 ( DXVI) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Petrus without colleague (or, less frequently, year 1269 '' Ab urbe co ...

, 631 , E=

, W=

914 __NOTOC__ Year 914 ( CMXIV) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire * Spring – Empress Zoe Karbonopsina leads a palace coup at Constantin ...

845 __NOTOC__ Year 845 ( DCCCXLV) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire * Byzantine–Arab War: A prisoner exchange occurs between the Byzan ...

, S1=NY Telecommunications-related introductions in 1947 Telecommunications-related introductions in 2009

203 Year 203 ( CCIII) was a common year starting on Saturday (link will display the full calendar) 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 condit ...

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

Service area

See also

References

External links