
Area code 203 is a telephone area code that covers the southwestern part of Connecticut. Basic principle A traditional landline telephone system also known as "plain old telephone service" (POTS, commonly handles both signaling and audio information A telephone numbering plan is a plan for allocating Telephone number ranges to countries regions areas and exchanges and to non-fixed telephone networks Connecticut ( is a state located in the New England region of the northeastern United States of America. The area code stretches from the New York border past the city of New Haven and ends just south of Hartford. New York ( is a state in the Mid-Atlantic and Northeastern regions of the United States and is the nation's third most populous
Counties served by this area code:
Cities and towns served by this area code:
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The CT Public Utility commission in August 1999 proposed an area code overlay for the 203 area code. Named after the extremely large area of salt-marshes and swamps both on the coast and inland Fairfield County is located in the southwestern corner of the U Sherman is the northernmost town of Fairfield County, Connecticut, United States. New Haven County is located in the south central part of the U Litchfield County is located in the northwestern corner of the U Ansonia is a city and town in New Haven County, Connecticut, U Bethany is a town in New Haven County, Connecticut, United States. Bethel is a town in Fairfield County, Connecticut, United States, about sixty miles from New York City. Bethlehem is a town in Litchfield County, Connecticut, United States. Branford is a town located on Long Island Sound in New Haven County, Connecticut, eight miles (13 km east of New Haven. Brookfield is a town located in northern Fairfield County, Connecticut, United States. Cheshire is a town in New Haven County, Connecticut, United States. Darien is a town in Fairfield County, Connecticut, United States. Derby is a city in New Haven County, Connecticut, United States. East Haven is a town in New Haven County, Connecticut, in the United States. Easton is a town in Fairfield County, Connecticut, United States. Fairfield is a town located in Fairfield County, Connecticut, United States. Greenwich is a town in Fairfield County, Connecticut, United States. Guilford is a town in New Haven County, Connecticut, United States, that borders Madison, Branford, North Branford Hamden is a town in New Haven County, Connecticut, United States. Madison is a town in the southeastern corner of New Haven County, Connecticut, and it occupies a central location on the Connecticut Shoreline area Meriden is a city in New Haven County, Connecticut, United States. Middlebury is a town in New Haven County, Connecticut, United States. Milford is a city in New Haven County, Connecticut, United States. Monroe is a town in Fairfield County, Connecticut, United States. Naugatuck is a consolidated town and borough in New Haven County, Connecticut, United States. New Canaan is a town in Fairfield County, Connecticut, United States, 8 miles (13 km northeast of Stamford, on the Five Mile River New Fairfield is a town in Fairfield County, Connecticut, United States. This article is about the town. For the borough see Newtown (borough, Connecticut. North Branford is a town in New Haven County, Connecticut, United States. North Haven is a suburban town in New Haven County, Connecticut on the outskirts of New Haven, Connecticut. Norwalk is a city in Fairfield County, Connecticut, United States. Orange is a town in New Haven County, Connecticut, United States. Oxford is a town located in western New Haven County, Connecticut, United States. Prospect is a town in New Haven County, Connecticut, United States. Redding is a town in Fairfield County, Connecticut, United States. Ridgefield is a town in Fairfield County, Connecticut, United States. Roxbury is a town in Litchfield County, Connecticut, United States. Seymour is a town located in western New Haven County, Connecticut, United States. Shelton is a city in Fairfield County, Connecticut, United States. Southbury is a town located in western New Haven County, Connecticut, United States north of Oxford and Newtown and east Stamford is a city in Fairfield County, Connecticut, United States. Stratford is a town in Fairfield County, Connecticut, United States, located on Long Island Sound at the mouth of the Housatonic Trumbull is a town in Fairfield County, Connecticut, United States. Wallingford is a town in New Haven County, Connecticut, United States. "West Haven" redirects here For other uses see West Haven (disambiguation West Haven is a city in New Haven County, Weston is a town in Fairfield County, Connecticut, United States. Westport is a coastal town located on Long Island Sound in Fairfield County, Connecticut, 47 miles north of New York City in the United Wilton is a town in Fairfield County, Connecticut, in the United States. Woodbridge is a town in New Haven County, Connecticut, United States. Woodbury is a town in Litchfield County, Connecticut, United States. In Telephony, especially in North America, an overlay plan is the practice of introducing a new Area code by applying it onto a geographic area The area code yet to be assigned is 475. Area code 475 is a proposed Telephone Area code to serve southwestern Connecticut; it will overlay the existing 203 area code. A date for implementing the new overlay area code has yet to be determined.
| State of Connecticut Area Codes: 203, 860 | ||
|---|---|---|
| North: 860 | ||
| West: 914, 845 | area code 203 | East: 860 |
| South: 516, 631 | ||
| State of New York Area Codes: 212, 315, 347, 516, 518, 585, 607, 631, 646, 716, 718, 845, 914, 917 | ||