Northeast region · Eastern Time
New Hampshire Area Codes
All 1 area code serving New Hampshire, the cities each one covers, and which are overlays. New Hampshire is served by 1 area code in the Eastern Time zone.
Last updated June 5, 2026
Full list
Every New Hampshire area code
New Hampshire is served by 1 area code in the Eastern Time zone. It is a single-code state, so seven-digit local dialing may still work in many places.
| Code | Main city | Type | Status |
|---|---|---|---|
| 603 | Manchester | Geographic | In service |
Area codes and dialing in New Hampshire
New Hampshire is one of the few US states still covered by a single area code, 603. Because there's no overlap, many local calls can still be completed with seven digits, although dialing the full 10-digit number always works and is the safer habit. 603 serves Manchester and the rest of the state, all in the Eastern Time zone.
If New Hampshire ever exhausts its supply of numbers, regulators would almost certainly add an overlay rather than split the state — the modern approach that lets everyone keep their existing number. For now, every New Hampshire number shares the 603 code. Learn the background in how area codes work.
Browse New Hampshire another way
Explore by Northeast region, by time zone, or jump to the city index. You can also see the complete numeric list of every US area code.
Quick answers
New Hampshire area code FAQ
How many area codes does New Hampshire have?
New Hampshire currently has 1 area code: 603.
What is the main area code for New Hampshire?
The busiest metro in New Hampshire is served by the 603 code. Major cities include Manchester.
Does New Hampshire require 10-digit dialing?
Much of the state still permits 7-digit local calls, though 10-digit dialing always works. Ten-digit dialing is the national standard.