Massachusetts Area Codes

Area codes: 9
ZIP codes: 685
Cities & towns: 510
Counties: 14

Every area code in Massachusetts

All Massachusetts area codes, what each primarily serves, and which share ground with another.
Area code	Primarily serves	Shares ground with	In service
339	Boston	781	2001
351	Boston	978	2001
413	Springfield	no overlay	1947
508	Boston	774	1988
617	Boston	857	1947
774	Boston	508	2001
781	Boston	339	1997
857	Boston	617	2001
978	Boston	351	1997

A code in the “shares ground” column is an overlay: it covers the same territory rather than a different part of Massachusetts, which is why local calls there are dialled as ten digits.

Which codes share the same ground

Massachusetts has 4 groups of codes that overlay one another: the codes inside a group cover the same territory rather than different parts of the state, so local calls there are dialled as ten digits.

413 has no overlay: it is the only code serving its territory.

Where Massachusetts's communities sit

Each point is a Massachusetts community, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Largest Massachusetts cities and their codes

largest 25

Scope every area code assigned to Massachusetts. Source LocalCallingGuide NPA list (2026-07 NPA list) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. Overlay relationships come from the numbering-plan authority; the city match is computed.