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Area Code Overview
Area code 351 is a geographic telephone area code in Massachusetts that went into service on May 2, 2001. The geographic regions covered by this area code overlay has a population of approximately 1,134,428.
Overlay and Dialing Rules
- Area Code: 351
- State: Massachusetts
- Type: General Purpose Code
- In Service Date: May 2, 2001
- Overlay Complex: 351/978
- Local Dialing Plan: This area does require you to dial the area code when calling locally.
Estimated Number of Assigned Phone Numbers in Area Code 351
This area code is ranked 337th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 9th out of 9.
722,000
Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 351
Wireline and VoIP
481,000 assigned
66.62%
Other / Unclassified
58,000 assigned
8.03%
Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 351
Estimated assigned wireless phone numbers: 183,000
Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.
Verizon Wireless 45,000 (24.59%)
AT&T Wireless 31,000 (16.94%)
MASS MOBILE LLC 10,000 (5.46%)
Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 351
Estimated assigned wireline and VoIP phone numbers: 481,000
Peerless Network 37,000 (7.69%)
Comcast Business 15,000 (3.12%)
TERRA NOVA TELECOM INC. 4,000 (0.83%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 1,000 (0.21%)
Other / Unclassified Assigned Numbering in Area Code 351
Estimated assigned other or unclassified phone numbers: 58,000
FRACTEL, LLC 18,000 (31.03%)
HD CARRIER LLC 15,000 (25.86%)
TON80 COMMUNICATIONS, LLC 10,000 (17.24%)
IP HORIZON LLC 7,000 (12.07%)
TC SYSTEMS, INC. 3,000 (5.17%)
IDT AMERICA, CORP. - MA 2,000 (3.45%)
BARR TELL USA, INC. - MA 1,000 (1.72%)
EXIANT COMMUNICATIONS LLC 1,000 (1.72%)
FIVE9, INC. 1,000 (1.72%)
Cities and Towns in Area Code 351
Acton, Massachusetts Amesbury, Massachusetts Andover, Massachusetts Ashburnham, Massachusetts Ashby, Massachusetts Athol, Massachusetts Ayer, Massachusetts Barre, Massachusetts Berlin, Massachusetts Beverly, Massachusetts Billerica, Massachusetts Bolton, Massachusetts Clinton, Massachusetts Concord, Massachusetts Danvers, Massachusetts Essex, Massachusetts Fitchburg, Massachusetts Gardner, Massachusetts Georgetown, Massachusetts Gloucester, Massachusetts Groton, Massachusetts Hamilton, Massachusetts Harvard, Massachusetts Haverhill, Massachusetts Hubbardston, Massachusetts Hudson, Massachusetts Ipswich, Massachusetts Lawrence, Massachusetts Leominster, Massachusetts Littleton, Massachusetts Lowell, Massachusetts Lunenburg, Massachusetts Manchester, Massachusetts Maynard, Massachusetts Merrimac, Massachusetts Newburyport, Massachusetts North Reading, Massachusetts Orange, Massachusetts Peabody, Massachusetts Pepperell, Massachusetts Petersham, Massachusetts Princeton, Massachusetts Rockport, Massachusetts Rowley, Massachusetts Salem, Massachusetts Shirley, Massachusetts Sterling, Massachusetts Sudbury, Massachusetts Templeton, Massachusetts Topsfield, Massachusetts Townsend, Massachusetts Tyngsboro, Massachusetts West Newbury, Massachusetts Westford, Massachusetts Westminster, Massachusetts Wilmington, Massachusetts Winchendon, Massachusetts These geographic regions are also served by area code 978.
How These Figures Were Built
These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 351, not live customer counts.
Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.
They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.
Population data and locality matching provided by GeoNames.
Last refreshed: April 15, 2026 6:22 pm