State directory / Connecticut
US number directory / Connecticut
Connecticut
area codes
NANPA records 4 active geographic area codes for Connecticut, including 203 from 1947.
4geographic area codes
in this reference
in this reference
Earliest listed203 · 1947
Standard timeET
Overlays in this stateYes — see code notes
Major city starting points
Hartford (capital): 860, 959; Bridgeport (largest city in state reference): 203, 475.
| City | Reference role | Codes to check |
|---|---|---|
| Hartford | Capital | 860, 959 |
| Bridgeport | Largest city in state reference | 203, 475 |
City reference · 2026-10-25
Codes, cities & coverage
Connecticut's active territorial overlay complexes are 203/475; 860/959.
| Code | Region / major cities named in the reference | Introduced | Active overlay complexes |
|---|---|---|---|
| 203 | South-west Connecticut ( Bridgeport , Danbury , New Haven , Waterbury ) | 01-Jan-1947 | 203/475 |
| 475 | Connecticut ( Bridgeport , Danbury , New Haven , Waterbury , and southwestern Connecticut) | 12-Dec-2009 | 203/475 |
| 860 | Northern and eastern Connecticut ( Hartford , Bristol, Norwich, and northern and eastern Connecticut) | 28-Aug-1995 | 860/959 |
| 959 | Northern and eastern Connecticut ( Hartford , Bristol, Norwich, and northern and eastern Connecticut) | 30-Aug-2014 | 860/959 |
NANPA dates & overlays · 2026-10-25
Wikipedia geography · 2026-10-25 · CC BY-SA 4.0
Time zones
Connecticut spans 1 standard-time offset in the state reference: ET.
| Standard offset | Region | Daylight saving |
|---|---|---|
| UTC−05:00 ET | Eastern Standard Time | Yes |