Northeast region · Eastern Time
Connecticut Area Codes
All 4 area codes serving Connecticut, the cities each one covers, and which are overlays. Connecticut is served by 4 area codes in the Eastern Time zone.
Last updated October 3, 2026
Full list
Every Connecticut area code
Connecticut is served by 4 area codes in the Eastern Time zone. 2 of these are overlay codes layered over busy metros; the rest are geographic codes.
| Code | Area served | Type | In service |
|---|---|---|---|
| 203 | Southwestern Connecticut including Bridgeport, New Haven, Stamford and Waterbury | Geographic | Since 1947 |
| 475 | Southwestern Connecticut including Bridgeport, New Haven, Stamford and Waterbury | Overlay | Since 2009 |
| 860 | Northern, central and eastern Connecticut including Hartford, New Britain and New London | Geographic | Since 1995 |
| 959 | Northern, central and eastern Connecticut including Hartford, New Britain and New London | Overlay | Since 2014 |
Area codes and dialing in Connecticut
Connecticut's 4 area codes mix older geographic codes with newer overlays. The busiest metros — around Bridgeport, Hartford — carry the most numbers and rely on overlays, which is why 10-digit dialing is required there. Quieter parts of the state may still use a single code. The oldest code in Connecticut is 203 (Bridgeport), one of the original 1947 area codes.
Whenever a Connecticut region runs low on numbers, a new overlay is added on top rather than splitting the map, so existing customers keep their numbers. See 10-digit dialing for what that means in practice, or the newest area codes for upcoming changes.
Connecticut city area code pages
Look up the area codes for a specific Connecticut city: Bridgeport · Hartford · New Haven · Stamford.
Browse Connecticut another way
Explore by Northeast region, by time zone, or jump to the city index. You can also see the complete numeric list of every US area code.
Quick answers
Connecticut area code FAQ
How many area codes does Connecticut have?
Connecticut currently has 4 area codes: 203, 475, 860, 959.
What is the main area code for Connecticut?
Connecticut has no single main code. Its original 1947 area code was 203; today the main cities are served by 203 (Bridgeport), 860 (Hartford), 475 (Bridgeport), 959 (Hartford).
Does Connecticut require 10-digit dialing?
Yes, in its overlay areas you must dial all 10 digits, even for local calls. Dialing all 10 digits always works, so it is the safe habit.