4 area codes assigned to Connecticut · Eastern Time
2 of Connecticut's area codes share territory with another. Codes in the same row serve the same places, so either can reach a number there — and ten-digit dialling is required throughout.
Connecticut went from one area code in 1947 to 4 today. A split carves territory off its parent; an overlay sits on top of it, which is why newer codes need ten-digit dialling.
Dates from the NANPA area code report, 09/19/2026.
Connecticut spans 2 LATAs — the regions a call is routed within before it becomes long-haul.
203
Connecticut
Eastern Time
Overlay · with 475
5,494 blocks · 32 rate centres
475
Connecticut
Eastern Time
Overlay · with 203
3,008 blocks · 32 rate centres
860
Connecticut
Eastern Time
Overlay · with 959
5,941 blocks · 57 rate centres
959
Connecticut
Eastern Time
Overlay · with 860
1,551 blocks · 52 rate centres
Connecticut has more than one area code in most regions. Enter a city to see which codes serve it, or check a specific number instead.
Connecticut has had 4 area codes activated as an overlay since 2021, sharing territory with an existing code rather than carving out new geography. Local calls in an overlaid region must be dialed with all ten digits. Earlier overlays are not listed here.
See every North American overlayConnecticut is served by 4 area codes in the North American Numbering Plan (NANP): 203, 475, 860, 959. All Connecticut numbers are in the Eastern Time zone. Click any area code above to see the cities and rate centers it covers, formatted tel: link examples, and to search for available phone numbers.