Area code 603

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Area code 603 in Red

Area code 603 is the sole area code for the U.S. state of New Hampshire in the North American Numbering Plan (NANP). The numbering plan area (NPA) was created as one of the original area codes in October 1947.

As of April 2011, the 603 code was nearing exhaustion and a second area code for New Hampshire was expected to be activated by 2013. Rather than a split, the New Hampshire Public Utilities Commission recommended that it be implemented as a statewide overlay.[1] However, because of a change in allocation policies and a reclamation of a large block of previously allocated phone numbers, the exhaustion time frame has possibly been moved beyond 2020.[2]

As 10-digit dialing is not mandatory in New Hampshire, callers from telephones within the 603 area code only need to dial the 7-digit subscriber number to reach other New Hampshire telephone numbers.


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New Hampshire area codes: 603
North: 819
West: 802 area code 603 East: 207
South: 351/978, 413
Massachusetts area codes: 339, 351, 413, 508, 617, 774, 781, 857, 978
Maine area codes: 207
Quebec area codes: 418, 438, 450, 514, 579, 581, 819
Vermont area codes: 802