Active Prefixes in Area Code 351

- 351-814
- Essex
- 351-206
- Rockport
- 351-209
- Acton, Massachusetts
- 351-444
- Ipswich
- 351-888
- Merrimac
- 351-277
- Lawrence
- 351-666
- Essex
- 351-205
- Georgetown
- 351-210
- Hudson, Massachusetts
- 351-247
- Lunenburg, Massachusetts
- 351-322
- Lowell
- 351-204
- Lawrence, Massachusetts
- 351-203
- Tyngsboro, Massachusetts
- 351-333
- Harvard
- 351-555
- Framingham, Massachusetts
- 351-207
- Georgetown
- 351-777
- Hubbardston
- 351-208
- Lowell, Massachusetts
- 351-201
- Danvers
- 351-200
- Ashby, Massachusetts
- 351-931
- Ua, Massachusetts
- 351-202
- Pepperell
- 351-212
- Danvers, Massachusetts
- 351-213
- Templeton, Massachusetts
- 351-999
- Manchester