List of Connecticut area codes

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This is a list of area codes in Connecticut:

203 - Covering southwestern Connecticut (Fairfield County (except for Sherman); New Haven County, and the towns of Bethlehem, Woodbury, as well as a small part of Roxbury in Litchfield County.)
475 - Overlaid 203 in December 2009.
860 - Northern and southeastern Connecticut
959 - Overlays 860; date TBD

In 1999, Connecticut announced that there would be two additional codes to be implemented when needed: 475, which would overlay 203; and 959, which would overlay 860. In March 2009, NANPA announced that Area Code 475 would overlay 203 in December 2009. Effective November 14, 2009, all calls originating from area code 203 or 860 must be dialed with 10 digits beginning with the area code, including calls within the same area code.

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v t e Lists of area codes in the North American Numbering Plan

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