Connecticut Area Codes – List Of Area Codes, Maps

Connecticut currently Using 4 Connecticut Area Codes. First established by AT&T and the Bell System in 1947, 203 covered the entire state of Connecticut. The most recently added was 959 in 2014 as an overlay to 860. Today, 860 is the most populated with an estimated 1.8 million of the state’s 3.6 million residents.

Connecticut Area Codes

List of area codes in Connecticut:

203 – Cover southwestern Connecticut (Fairfield County,New Haven County, and the towns of Bethlehem, Woodbury, as well as a small part of Roxbury in Litchfield County.)

475 – Overlap 203 in December 2009

860 – Northern and southeastern Connecticut

959 – Overlap 860 since late August 2014.

History of Connecticut Area Codes:

Area code 203 was Open into service. In 1995 Area code 203 was divided to form area code 860. In 2009 area code 203 overlay with area code 475.

Area code 860 was Out into service. Area code 860 was created from a break of area code 203.

Area code 475 was Out into service. Area code 475 is an overlap of area code 203.

Area code 959 was put into service. Area code 959 is an overlap of area code 860.

Connecticut Area Codes

What Is Area Code?

Area Code Is A three-digit code that Finds one of the telephone areas into which the U.S. and other countries are divided and that is the local telephone number when dialing a call between areas.

Why are area codes added?

Area codes are added when the current number expires. In North America, each area code has a potential capacity of about 8 million unique phone numbers. Increased use of cellular phones, modems, and Internet access may require existing telephone number resources, additional area codes may be required, according to Nestar.


Once the new area code starts being assigned, there is usually a six-month period of transition, where customers are encouraged, but not required, to use the new code, but seven-digit. Dialing is allowed. After six months, callers are required to use the appropriate area code and telephone number.

Other States Area Codes

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