Northeast region · Eastern Time
Massachusetts Area Codes
All 9 area codes serving Massachusetts, the cities each one covers, and which are overlays. Massachusetts is served by 9 area codes in the Eastern Time zone.
Last updated October 1, 2026
Full list
Every Massachusetts area code
Massachusetts is served by 9 area codes in the Eastern Time zone. 4 of these are overlay codes layered over busy metros; the rest are geographic codes.
| Code | Area served | Type | In service |
|---|---|---|---|
| 339 | Inner Boston suburbs ringing the 617 area, from Lynn to Weymouth | Overlay | Since 2001 |
| 351 | Northeastern Massachusetts including Lowell, Lawrence, the North Shore and Fitchburg | Overlay | Since 2001 |
| 413 | Western Massachusetts including Springfield, Pittsfield and the Pioneer Valley | Geographic | Since 1947 |
| 508 | Central and southeastern Massachusetts, including Worcester, Cape Cod and the islands | Geographic | Since 1988 |
| 617 | Boston and its closest neighbors including Cambridge, Quincy and Newton | Geographic | Since 1947 |
| 774 | Central and southeastern Massachusetts, including Worcester, Cape Cod and the islands | Overlay | Since 2001 |
| 781 | Inner Boston suburbs ringing the 617 area, from Lynn to Weymouth | Geographic | Since 1997 |
| 857 | Boston and its closest neighbors including Cambridge, Quincy and Newton | Overlay | Since 2001 |
| 978 | Northeastern Massachusetts including Lowell, Lawrence, the North Shore and Fitchburg | Geographic | Since 1997 |
Area codes and dialing in Massachusetts
Massachusetts's 9 area codes mix older geographic codes with newer overlays. The busiest metros — around Boston, Lowell, Lynn — carry the most numbers and rely on overlays, which is why 10-digit dialing is required there. Quieter parts of the state may still use a single code. The original code in the Massachusetts list is 339 (Lynn).
Whenever a Massachusetts region runs low on numbers, a new overlay is added on top rather than splitting the map, so existing customers keep their numbers. See 10-digit dialing for what that means in practice, or the newest area codes for upcoming changes.
Cities with multiple area codes
These Massachusetts metros are served by an overlay of two or more codes, so 10-digit dialing applies: Boston · Lowell · Lynn · Worcester.
Browse Massachusetts another way
Explore by Northeast region, by time zone, or jump to the city index. You can also see the complete numeric list of every US area code.
Quick answers
Massachusetts area code FAQ
How many area codes does Massachusetts have?
Massachusetts currently has 9 area codes: 339, 351, 413, 508, 617, 774, 781, 857, 978.
What is the main area code for Massachusetts?
The busiest metro in Massachusetts is served by the 339 code. Major cities include Boston, Lowell, Lynn, Springfield, Worcester.
Does Massachusetts require 10-digit dialing?
Yes, in its overlay metros you must dial all 10 digits. Ten-digit dialing is the national standard.