Middlesex County, Massachusetts

81 ZIP codes · 817.88 sq mi of land · FIPS 25017

Population	1,638,365
State	Massachusetts
FIPS code	25017
Time zone	Eastern
Land area	817.88 sq mi
Center (lat, long)	42.4817, -71.3949

Area codes in this area

339 351 617 781 857 978

These are the area codes that most often serve Middlesex County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Cities and towns (largest first)

Cambridge · 118,796 Lowell · 118,368 Somerville · 81,036 Framingham · 72,399 Malden · 65,906 Medford · 59,354 Everett · 50,045 Woburn · 41,939 Marlborough · 41,647 Wakefield · 27,793 Burlington · 26,274 Reading · 25,612 Winchester · 23,406 Wilmington · 23,336 Hudson · 15,719AshbyAyerGrotonLittletonPepperellShirleyTownsendWest TownsendActonBoxboroughAshlandBedfordHanscom AfbCarlisleConcord

ZIP codes in Middlesex County

01431 Ashby 01432 Ayer 01450 Groton 01460 Littleton 01463 Pepperell 01464 Shirley 01469 Townsend 01474 West Townsend 01701 Framingham 01702 Framingham 01718 Acton 01719 Boxborough 01720 Acton 01721 Ashland 01730 Bedford 01731 Hanscom Afb 01741 Carlisle 01742 Concord 01746 Holliston 01748 Hopkinton 01749 Hudson 01752 Marlborough 01754 Maynard 01760 Natick 01770 Sherborn 01773 Lincoln 01775 Stow 01776 Sudbury 01778 Wayland 01801 Woburn 01803 Burlington 01821 Billerica 01824 Chelmsford 01826 Dracut 01827 Dunstable 01850 Lowell 01851 Lowell 01852 Lowell 01854 Lowell 01862 North Billerica 01863 North Chelmsford 01864 North Reading 01867 Reading 01876 Tewksbury 01879 Tyngsboro 01880 Wakefield 01886 Westford 01887 Wilmington 01890 Winchester 02138 Cambridge 02139 Cambridge 02140 Cambridge 02141 Cambridge 02142 Cambridge 02143 Somerville 02144 Somerville 02145 Somerville 02148 Malden 02149 Everett 02155 Medford

Showing 60 of 81. See all MA ZIP codes.

Population: U.S. Census Bureau, ACS 5-year estimates, 2024.