9 area codes assigned to Massachusetts · Eastern Time
4 of Massachusetts's area codes share territory with another. Codes in the same row serve the same places, so either can reach a number there — and ten-digit dialling is required throughout.
The remaining code covers their own area: 413.
Massachusetts went from 2 area codes in 1947 to 9 today. A split carves territory off its parent; an overlay sits on top of it, which is why newer codes need ten-digit dialling.
Dates from the NANPA area code report, 09/19/2026.
Massachusetts spans 3 LATAs — the regions a call is routed within before it becomes long-haul.
339
Massachusetts
Eastern Time
Overlay · with 781
1,091 blocks · 35 rate centres
351
Massachusetts
Eastern Time
Overlay · with 978
808 blocks · 43 rate centres
413
Massachusetts
Eastern Time
4,840 blocks · 63 rate centres
508
Massachusetts
Eastern Time
Overlay · with 774
5,015 blocks · 95 rate centres
617
Massachusetts
Eastern Time
Overlay · with 857
4,757 blocks · 27 rate centres
774
Massachusetts
Eastern Time
Overlay · with 508
5,211 blocks · 85 rate centres
781
Massachusetts
Eastern Time
Overlay · with 339
6,162 blocks · 41 rate centres
857
Massachusetts
Eastern Time
Overlay · with 617
3,824 blocks · 20 rate centres
978
Massachusetts
Eastern Time
Overlay · with 351
6,481 blocks · 58 rate centres
Massachusetts has more than one area code in most regions. Enter a city to see which codes serve it, or check a specific number instead.
Massachusetts has had 8 area codes activated as an overlay since 2021, sharing territory with an existing code rather than carving out new geography. Local calls in an overlaid region must be dialed with all ten digits. Earlier overlays are not listed here.
Massachusetts is served by 9 area codes in the North American Numbering Plan (NANP): 339, 351, 413, 508, 617, 774, 781, 857, 978. All Massachusetts numbers are in the Eastern Time zone. Click any area code above to see the cities and rate centers it covers, formatted tel: link examples, and to search for available phone numbers.