Business phone numbers and phone menus for the United States and Canada. FRES(510) 288-6288[email protected]Sign in
autoattendant.ioBusiness phone menus
FrançaisEspañol Get started

Home › Area codes › New Hampshire

US area codes

New Hampshire area codes

A checked list of 1 in-service geographic area code in New Hampshire, with their dates, overlay partners and dialing rules.

Last checked 14 October 2026

Area codes across North America

Codes in service in New Hampshire

New Hampshire has one geographic area code in service: 603, dated 1947 in NANPA's database.1 603 is on Eastern time.

Area codeNANPA locationNPA in-service dateIn-service overlay peersTime zoneLocal calls within the code
603NH1947None listedEastern10 digits

Scroll the table sideways to see every column. Sources: NANPA (14 October 2026 file).

History and overlays in New Hampshire

NANPA lists no in-service overlay for 603.1

Dialing in New Hampshire

Local calls within 603 are recorded as 10 digits. Local calls from 603 to other area codes are recorded as 1 + 10 digits.1

Neighbours of New Hampshire

Regions that border New Hampshire:

Rules that apply to every region are on the area-code reference.

Get a number in New Hampshire
Sign up and search for a local number by area code; the app shows only numbers in stock, and big-city codes often sell out, so no specific code is guaranteed.
Get started

Further reading

Longer research pieces on this topic, each with its own source list and a downloadable PDF.

Article · 24 min read
Which Area Code Should Your Business Phone Number Use?
A 2026 U.S. guide to choosing a business phone area code, with overlay examples, a service-area decision tree, porting rules, and an inventory checklist.
Article · 21 min read
How Long Does It Take to Port a Phone Number?
A 2026 guide to phone number porting times, from 2.5-hour mobile transfers to six-week complex ports, with U.S., Canada, U.K. and Australia rules.
Article · 26 min read
What Phone Number to Use on Google Business Profile
A 2026 U.S. guide to choosing a Google Business Profile primary number, evaluating tracking versus a stable main line, checking account ownership, and testing calls before and after an edit.

Articles on this topic

Topics Business phone number Virtual phone number All topics

Article · 26 min read
How to Get a Business Phone Number: Options & Costs
Learn how to get a business phone number in 2026, compare eight option types and real team pricing, and check porting, identity, toll-free and emergency-calling requirements.
Article · 25 min read
Why Your Business Number Shows as Spam Likely
A 2026 US diagnostic guide to Spam Likely labels, covering CNAM, STIR/SHAKEN, carrier testing, spoofing, and free redress routes.
Article · 23 min read
How to Check Phone Number History for a New Business
Learn how to check phone number history in 2026 before publishing a new business number: verify public listings, test calls, compare provider remedies and decide whether to accept or replace it.
Article · 23 min read
Business Call Forwarding to Cell Phone: Caller ID and Voicemail
A 2026 test guide for business calls forwarded to staff mobiles: identify the incoming number, prevent personal voicemail pickup, verify callbacks, and compare routing options.

Sources

Every regulatory and pricing claim on this page links to the primary source it came from. Figures were checked on the date shown at the top of the page; rules and prices change, so verify before relying on one.

  1. NANPA, NPA Database CSV, file dated 14 October 2026; US geographic codes, location, dates, overlay complexes, dialing plan and time zone. Retrieved 14 Oct 2026
    https://reports.nanpa.com/public/npa_report.csv

Keep reading

Reference
How overlays work
Why two codes can serve the same area and what ten-digit dialling changes.
Start
Get a number in New Hampshire
Search by area code in the app; availability varies by code.