The state of Connecticut, USA is currently served by a total of 4 area codes:
These Connecticut area codes overlay (cover the same geographic area). The first code listed is the parent code. Overlay area codes are added when no more phone numbers are available in an existing Numbering Plan Area.
| City | County | Area code(s) |
|---|---|---|
| Bridgeport | Fairfield | 203/475 |
| Bristol | Hartford | 860/959 |
| Danbury | Fairfield | 203/475 |
| East Hartford | Hartford | 860/959 |
| Hartford | Hartford | 860/959 |
| Manchester | Hartford | 860/959 |
| Meriden | New Haven | 203/475 |
| Middletown | Middlesex | 860/959 |
| Milford | New Haven | 203/475 |
| Naugatuck | New Haven | 203/475 |
| New Britain | Hartford | 860/959 |
| New Haven | New Haven | 203/475 |
| Newington | Hartford | 860/959 |
| Norwalk | Fairfield | 203/475 |
| Norwich | New London | 860/959 |
| Shelton | Fairfield | 203/475 |
| Stamford | Fairfield | 203/475 |
| Stratford | Fairfield | 203/475 |
| Torrington | Litchfield | 860/959 |
| Trumbull | Fairfield | 203/475 |
| Waterbury | New Haven | 203/475 |
| West Hartford | Hartford | 860/959 |
| West Haven | New Haven | 203/475 |