Area codes 203 and 475

Area codes 203 and 475 are telephone area codes in the North American Numbering Plan (NANP) for the southwestern part of the U.S. state of Connecticut.

When the American Telephone and Telegraph Company (AT&T) established the first nationwide numbering plan in 1947, Connecticut received only a single area code, 203, of the 86 original North American area codes.

[2] This overlay was first proposed by the Connecticut Department of Public Utility Control in August 1999.

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

[citation needed] The counties included in the numbering plan area are:[4] This serves the following cities and towns:[4] 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.