Connecticut area codes
| 203 | Connecticut (Bridgeport, New Haven, Waterbury and southwestern Connecticut; proposed overlay with 475) |
| 475 | Connecticut (Bridgeport, New Haven, Waterbury and southwestern Connecticut, overlays with 203). |
| 860 | Connecticut (Bristol, Hartford, Norwich and northern and eastern Connecticut) |
| 959 | Connecticut (Bristol, Hartford, Norwich and northern and eastern Connecticut, overlays with 860) |
