New Hampshire is served by a single area code as of 2026. This guide walks through which code it is, when it was assigned, how it has held up against population growth, and what the prospects look like for additional codes in the future.
The Short Answer
New Hampshire currently has one active area code in service. The code has held its territory without needing relief since it was assigned, which reflects New Hampshire’s population size and the rate at which new phone lines are being activated in the state.
By population, New Hampshire ranks #41 nationally with roughly 1,409,032 residents as of the most recent estimates. That puts the state’s area code count in line with its population peers — denser, faster-growing states need more codes; smaller states need fewer.
The New Hampshire Area Code
The active area codes serving New Hampshire are listed below, in numerical order. Where a code is an overlay or a split-off from an earlier code, that relationship is noted.
- 603 — Entire state of New Hampshire
How New Hampshire’s Area Codes Grew Over Time
New Hampshire received its first area code, 603, when the North American Numbering Plan launched in 1947. That single code initially covered the entire state, and subsequent splits and overlays narrowed it over the decades that followed.
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Browse New Hampshire Area Codes →- 1947 — 603 assigned as one of the original North American area codes in October 1947, covering the entire state of New Hampshire, a role it still holds today.
- 2011 — 603 was projected to near exhaustion, and a statewide overlay was expected to be activated by 2013 to add a second area code.
- 2021 — New Hampshire transitioned to mandatory ten-digit dialing by October 24, 2021, after the 988 central office code was retired to make way for the nationwide 988 Suicide and Crisis Lifeline.
What’s Next for New Hampshire Area Codes
New Hampshire remains a single-area-code state, served entirely by 603. A second code was once expected around 2013, but changes in allocation policy, including number pooling and the reclamation of a large block of previously assigned numbers, pushed the projected exhaustion of 603 to at least 2032. NANPA’s recent NPA exhaust analyses continue to show 603 with a long runway, so no overlay or split is on the near-term relief schedule.
Frequently Asked Questions
How many area codes does New Hampshire have?
New Hampshire has one active area code in service. Demand has not yet pushed the territory into needing relief through a split or an overlay.
What is the oldest area code in New Hampshire?
603 is the oldest active area code in New Hampshire, assigned in 1947 when the North American Numbering Plan launched. It remains in service today, though its geographic footprint has typically been reduced by subsequent splits and overlays.
What is the newest area code in New Hampshire?
The most recent area code addition to New Hampshire was 988, activated in 2021. New phone lines provisioned in its service area are increasingly drawn from this code as older overlays approach exhaustion.
Does New Hampshire have more than one area code?
No. New Hampshire is one of a small number of U.S. states still served by a single area code. 603 has covered the entire state since 1947 and remains the only geographic area code in use today.
Why does New Hampshire still have only one area code?
603 has had enough available numbers to serve the whole state. A second code was projected around 2013, but number pooling and the reclamation of unused number blocks extended the supply, moving the exhaustion estimate to at least 2032.
Do I have to dial the area code in New Hampshire?
Yes. Since October 2021, all calls within New Hampshire require ten-digit dialing (area code plus the seven-digit number). The change was made when the 988 prefix was set aside for the national Suicide and Crisis Lifeline.
Is 603 a real area code?
Yes. 603 is the sole area code for New Hampshire and one of the 86 original area codes assigned at the launch of the North American Numbering Plan in 1947. It covers cities including Manchester, Nashua, Concord, and Portsmouth.
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We carry available New Hampshire numbers right now. Order a 603 number directly — a one-time fee, no monthly charges, with pricing From $150 depending on the digit pattern and memorability of the number. Prefer help choosing? Call us at (212) 580-2000.
