Area codes in New Haven, Connecticut
New Haven, Connecticut uses 2 area codes — 203 and 475. The main New Haven area code is 203.
Area codes serving New Haven
Phone numbers in New Haven are written as ten digits — for example (203) 555-0190 — and fall in the Eastern Time zone.
How New Haven came to have 2 area codes
The original New Haven area code is 203, in service since 1947. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 475 (2009). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why New Haven now uses all 2 codes and every local call is dialed with ten digits.
All Connecticut area codes · Is a New Haven call a scam?
Nearby cities
- Bridgeport area codes
- Bristol area codes
- Danbury area codes
- Hartford area codes
- White Plains area codes
- Mount Vernon area codes
- Garden City area codes
- Yonkers area codes
Frequently asked questions
What is the area code for New Haven?
The main area code for New Haven, Connecticut is 203. New Haven is now served by 2 area codes in total: 203, 475.
How many area codes does New Haven have?
New Haven has 2 area codes: 203, 475.
Why does New Haven have more than one area code?
As New Haven used up the numbers available in its original area code (203, in service since 1947), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a New Haven number?
Dial all 10 digits — the area code (203 or 475) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.