Connecticut · Eastern Time
New Haven, CT Area Codes
New Haven is served by 2 area codes (203, 475). Here's which is original, which are overlays, and how to pick one for a new local number.
Last updated October 3, 2026 · Source: NANPA
Area codes serving New Haven
New Haven sits in Connecticut, part of the Northeast region and the Eastern Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 203, 475.
The original code is 203 (in service since 1947). As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.
| Code | Area served | In service |
|---|---|---|
| 203 | Southwestern Connecticut including Bridgeport, New Haven, Stamford and Waterbury | January 1, 1947 |
| 475 | Southwestern Connecticut including Bridgeport, New Haven, Stamford and Waterbury | December 12, 2009 |
Nearby cities sharing these area codes
- Bridgeport
- Stamford
- Waterbury
- Norwalk
- Danbury
- Greenwich
- Hamden
- Meriden
- Milford
- Stratford
- Fairfield
- West Haven
- Shelton
- Naugatuck
How to pick an area code for a new number
When you activate a new line in New Haven, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 203), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.
Dialing in New Haven
Because New Haven is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. From outside the US, dial +1, then the area code and number. See 10-digit dialing and overlay area codes for the background. For every code in Connecticut, visit the Connecticut area codes page.
Quick answers
New Haven area code FAQ
What area codes does New Haven use?
New Haven, CT is served by 2 area codes: 203, 475.
Which is the original New Haven area code?
203 is the original code for New Haven, in service since 1947; the others were added later for more numbers.
What time zone is New Haven in?
New Haven is in the Eastern Time zone.
Do I need to dial the area code in New Haven?
Yes. With multiple overlapping codes, 10-digit dialing is required for every call in this area.