Massachusetts ZIP Codes

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

How Massachusetts ZIP codes are numbered

010xx–055xx

The first three digits identify the sectional center facility that processes mail for a region, so a Massachusetts ZIP code can be placed geographically from its prefix alone. Each row names the city holding the most codes in that prefix.

Massachusetts three-digit ZIP prefixes, the codes in each, and the city that holds the most of them.
Prefix	ZIP codes	Main area
010xx	70	Chicopee
011xx	22	Springfield
012xx	37	Pittsfield
013xx	31	Greenfield
014xx	26	Groton
015xx	51	Shrewsbury
016xx	17	Worcester
017xx	31	Framingham
018xx	47	Lowell
019xx	38	Lynn
020xx	38	Dedham
021xx	62	Boston
022xx	20	Boston
023xx	45	Brockton
024xx	36	Waltham
025xx	28	Buzzards Bay
026xx	40	Centerville
027xx	44	New Bedford
055xx	2	Andover

Where Massachusetts's communities sit

Each point is a Massachusetts community with a published ZIP code list, 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

Massachusetts cities by ZIP code count

largest 25

Area codes serving Massachusetts

Scope every ZIP code recorded in Massachusetts. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. The map outline is a convex envelope of published places, not a state boundary.