Hartford skyline in Connecticut, served by the 860 and 959 area codes

Connecticut area codes: 203, 475, 860 and 959

In use across Connecticut: 4 area codes. The oldest came about in 1947, while the newest, 959, began serving in 2014.

Codes currently in use: 4
Most recent code: 959
Rate centre list: 89
The time zones: Eastern

All Connecticut area codes

Code	Main places	Since	Overlay	Time zone	Exhaust
203	Ansonia-derby, Branford, Bridgeport and more	1947	475	Eastern time	2055
860	Bristol, Canaan, Canterbury and more	1995	959	Eastern time	2091
475	Ansonia-derby, Branford, Bridgeport and more	2009	203	Eastern time	2055
959	Bristol, Canaan, Canterbury and more	2014	860	Eastern time	2091

Data come from NANPA: the area code report, the rate-centre report and the exhaust projections, as of the file dated 11/01/2026. We are not an official NANPA site.

Where Connecticut's area codes came from

For 48 years 203 served Connecticut on its own, until 860 opened in 1995.

1947: 203 was one of the original 1947 area codes, covering Ansonia-derby, Branford and Bridgeport.
1995: 860 was split off from 203, serving Bristol, Canaan and Canterbury.
2009: 475 was added over 203 as an overlay, covering the same area.
2014: 959 was added over 860 as an overlay, covering the same area.

Dialling within Connecticut

A local call in 203, 860, 475 and 959 uses 10-digit dialling; a long-distance call uses 1 + 10-digit dialling.

Which places use each Connecticut area code

203 and 475 cover one overlay area with 32 rate centres in all

Ansonia-derby, Branford, Bridgeport, Woodbury, Byram, Wolcott, Wilton, Westport, Waterbury, Wallingford, Trumbull, Stamford, Seymour, Ridgefield, Redding, Old Greenwich, Norwalk, Newtown, New Haven, New Canaan, Naugatuck, Milford, Meriden, Madison, Huntington, Guilford, Greenwich, Georgetown, Fairfield, Darien, Danbury, Cheshire.

860 and 959 cover one overlay area with 57 rate centres in all

Winsted, Windsor Locks, Windsor, Willimantic, Watertown, Washington, Torrington, Thomaston, Storrs, Stafford Springs, Southington, Simsbury, Sharon, Rockville, Putnam, Plainville, Plainfield, Pawcatuck, Old Saybrook, Norwich, North Thompson, Norfolk, Niantic, New Milford, New London, New Britain, Mystic, Moodus, Middletown, Manchester, Lyme, Litchfield, Ledyard, Lebanon, Lakeville, Killingworth, Kent, Jewett City, Harwinton, Hartford, Haddam, Glastonbury, Farmington, Essex, Enfield, East Hampton, Deep River, Danielson, Coventry, Cornwall, Columbia, Colchester, Clinton, Canton, Bristol, Canaan, Canterbury.

Is a new area code coming to Connecticut?

Not for years: NANPA expects 203/475 to be the first to run out, in 2055.

Code or overlay group	Forecast exhaust	Forecast in 2023.2	Change
203/475	2055 4Q	2047	8 years later than in 2023.2
860/959	2091 1Q	2050	41 years later than in 2023.2

Area codes in states bordering Connecticut

Codes in Massachusetts: 413, 617, 508, 781, 978, 339, 351, 774 and 857
Codes in New York: 212, 315, 518, 716, 914, 516, 607, 718, 917, 646, 347, 631, 845, 585, 929, 934, 680, 332, 838, 363, 329, 624 and 465
Rhode Island: 401

Cities in Connecticut

Area codes for Hartford.

Questions about Connecticut area codes

How many area codes are there in Connecticut?

There are 4 in service, according to the NANPA file of 11/01/2026.

What is the oldest Connecticut area code?

Since 1947, the code 203 has been in service.

Are overlays used in Connecticut?

Yes: 203, 860, 475 and 959 each share an area with another code, so a local call there needs the full 10-digit number.

How can I get a Connecticut number?

Pick the code you want, then compare providers by first-year cost.

Which area code does Hartford use?

The codes 860 and 959 serve Hartford. See Hartford area codes.