| 339 | Massachusetts (Saugus, Norwood, Waltham, Woburn, east central Massachusetts and other Boston suburbs along Route 128, overlays with 781) More information at: Area Code 339 Phone Number Blocks |
| 351 | Massachusetts (Fitchburg, Peabody and northeastern Massachusetts, overlays with 978) More information at: Area Code 351 Phone Number Blocks |
| 413 | Massachusetts (Pittsfield, Springfield, Holyoke, Greenfield and western Massachusetts) More information at: Area Code 413 Phone Number Blocks |
| 508 | Massachusetts (Worcester, New Bedford and southeastern Massachusetts, overlays with 774) More information at: Area Code 508 Phone Number Blocks |
| 617 | Massachusetts (Boston, Cambridge, east central Massachusetts and close-in Boston suburbs, overlays with 857) More information at: Area Code 617 Phone Number Blocks |
| 774 | Massachusetts (Worcester, New Bedford and southeastern Massachusetts, overlays with 508) More information at: Area Code 774 Phone Number Blocks |
| 781 | Massachusetts (Saugus, Norwood, Waltham, Woburn, east central Massachusetts and other Boston suburbs along Route 128, overlays with 339) More information at: Area Code 781 Phone Number Blocks |
| 857 | Massachusetts (Boston, Cambridge, east central Massachusetts and close-in Boston suburbs, overlays with 617) More information at: Area Code 857 Phone Number Blocks |
| 978 | Massachusetts (Fitchburg, Peabody and northeastern Massachusetts, overlays with 351) More information at: Area Code 978 Phone Number Blocks |
