Area code 203 is the North American telephone area code that covers the southwestern part of Connecticut. The area code stretches from its western border, along its southern coast, to beyond the city of New Haven, and ends just south of Hartford. (The rest of Connecticut is served by the 860 area code.) 203 overlays with area code 475. The area encompassed by 203 and 475 roughly corresponds to the part of Connecticut belonging to metro NYC. Prior to August 28, 1995, area code 203 encompassed all of Connecticut.
The City of Meriden is notable as the only place in Connecticut where one can call towns in both the Hartford and New Haven exchanges toll-free from a home (landline) phone.
Counties served by 203/475: [1]
Cities and towns served by 203/475: [2]
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The Connecticut Department of Public Utility Control, in August 1999, proposed an area code overlay for the 203 area code.[3] Area code 475 went into effect on December 12, 2009. 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 [4]; this is because when needed, an overlay of area code 959 on area code 860 will be implemented.
The first range of available numbers in Connecticut's third area code was (475) 882-4xxx, in the Huntington section of Shelton.
| Connecticut area codes: 203, 475, 860 | ||
|---|---|---|
| North: 860, 959 | ||
| West: 914, 845 | area codes 203 and 475 | East: 860, 959 |
| South: 516, 631 | ||
| New York area codes: 212, 315, 347, 516, 518, 585, 607, 631, 646, 716, 718, 845, 914, 917 | ||