New Hampshire Area Codes
1 active area code · Manchester · Population around 1,408,518
New Hampshire has 1 active area code, serving cities like Manchester, Nashua, and Concord. 603 has covered the whole of New Hampshire since 1947. Each code below links to its cities, carriers, timezone, and coverage map.
New Hampshire Area Code Map
What area codes does New Hampshire have?
Every one of the 10 counties in New Hampshire is covered by this code and no other.
How many phone prefixes does New Hampshire use?
New Hampshire's area code holds 747 assigned prefixes, listed under 54 distinct carrier names. A prefix is the three digits after the area code, and NANPA assigns each one to a single carrier.
Sources: City populations – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). State populations – the same program, Vintage 2025 (CO-EST2025-ALLDATA). Area-code footprint and county populations – 2020 Census Centers of Population, mapped against NANP area code boundaries. The share of each city inside a code is measured the same way, against Census place boundaries from the Census Bureau's TIGERweb service. Area code assignments – NANPA CO Code data. See our data methodology.
Frequently Asked Questions
How many area codes does New Hampshire have?
New Hampshire has 1 active area code: 603.
What is the main area code for New Hampshire?
New Hampshire has a single area code, 603, in service since 1947. It covers Manchester, the largest city in New Hampshire, and every county in New Hampshire.
What are the largest cities in New Hampshire?
The largest cities in New Hampshire include Manchester, Nashua, Concord, Dover, Rochester.
What is the total population of New Hampshire?
New Hampshire has an estimated total population of 1,408,518 based on US Census PEP 2024 data.
What is the newest area code in New Hampshire?
603, in service since 1947. It is the only area code in New Hampshire.
Is my county covered by more than one area code in New Hampshire?
No. All 10 counties in New Hampshire are covered by 603, so no county here carries two.