New Hampshire Area Codes
Complete directory of all 1 active area codes serving New Hampshire. The The Granite State has a population of 1,402,052 (2023 estimate) and uses 1 area code.
About Area Codes in New Hampshire
New Hampshire (NH) is the The Granite State, located in the Northeast region of the United States. With a 2023 population of 1,402,052 residents, New Hampshire is served by 1 active area code. The state capital is Concord and the largest city is Manchester.New Hampshire's official motto is "Live Free or Die."
Area code assignments in New Hampshire follow the North American Numbering Plan (NANP), which has been in effect since 1947. As the state's population and demand for phone numbers grew — driven by the rise of cell phones, fax machines, pagers, and VoIP lines — regulators either split existing area codes geographically or added overlay codes that share the same territory. That's why New Hampshire now has 1 codes: 603.
When you receive a call from a New Hampshire number, the area code tells you only where the number was originally assigned. Because of Local Number Portability (LNP), which took effect in 2003, callers can keep their phone numbers even when moving across state lines. So while a 603 number was once assigned in New Hampshire, the person calling you could be anywhere in the US today.
Time zones in New Hampshire
New Hampshire observes the Eastern time zone. Daylight Saving Time is observed from the second Sunday in March through the first Sunday in November, when clocks shift forward by one hour. When you call a New Hampshire number from outside the state, double-check the local time above each area code detail page to avoid calling at unreasonable hours.
Phone number format in New Hampshire
All New Hampshire phone numbers follow the standard 10-digit NANP format: (NPA) NXX-XXXX. For local calls within New Hampshire, you typically need to dial the full 10-digit number — even for calls within the same area code — because of mandatory 10-digit dialing imposed by the FCC for areas with overlay codes (most of New Hampshire's territory). For long-distance calls within the NANP, dial 1 + area code + 7-digit number.
Frequently asked questions about New Hampshire area codes
How many area codes does New Hampshire have?
New Hampshire currently has 1 active area code: 603.
What is New Hampshire's original area code?
The oldest area code(s) in New Hampshire were assigned in 1947 as part of the original 86 NANP codes. These legacy codes typically covered the entire state at first, then were split as demand grew.
What time zone is New Hampshire in?
New Hampshire is in the Eastern time zone.
Will New Hampshire get more area codes?
As New Hampshire's population and number demand grow, NANPA may assign additional overlay codes. When the current codes run out of available prefixes, regulators announce public hearings and propose new codes. The AreaCodeCentral team tracks these announcements and updates the directory within 24 hours of any new code activation.