Administrative division — Middlesex сounty
- Acton Population: 20897
- Admirals Hill
- Arlington Population: 42844
- Arlington Heights
- Ashby Population: 2895
- Ashland Population: 15802
- Auburndale
- Ayer Population: 2868
- Ayres City
- Babbatasset Village
- Baker Bridge
- Beaver Brook Station
- Bedford Population: 12502
- Bedford Springs
- Belmont Population: 24729
- Belvidere
- Bemis
- Camp Kiwanis
- Camp Mary Day
- Camp Massapoag
- Camp Nashoba
- Camp Ted
- Camp Wakitatina
- Carlisle Population: 4799
- Carlisle Station
- Cedar Hill Camp
- Cedarwood
- Central Square
- Centralville
- Chelmsford Population: 33925
- Chelmsford Center
- Chestnut Hill
- Clematis Brook Station
- Coburnville
- Cochituate Population: 6569
- East Groton
- East Holliston
- East Lexington
- East Littleton
- East Natick
- East Pepperell Population: 2059
- East Somerville
- East Sudbury Station
- East Watertown
- Edgeworth
- Eliot
- Everett Population: 41667
- Farm Hill
- Faulkner
- Felchville
- Fells
- Flints Corner
- Hastings
- Havenville
- Hayden Row
- Hayward Corner
- Haywardville
- Hendersonville
- Highlands
- Holliston Population: 14010
- Hopkinton Population: 2550
- Hovey Corner
- Hudson Population: 14907
- Idylwide
- Kelly Corner
- Kendal Green
- Kenwood
- Maplewood
- Marlborough Population: 38499
- Marlborough Junction
- Maynard Population: 10106
- Medford Population: 56173
- Medford Hillside
- Melrose Population: 26983
- Melrose Highlands
- Meriams Corner
- Metcalf
- Mishawum
- Montrose
- Montvale
- Morseville
- Mount Auburn
- Munroe Station
- Nabnasset
- Pepperell Population: 2504
- Pinehurst Population: 7152
- Reading Population: 24747
- South Lincoln
- Stoneham Population: 21437
- Stow Population: 6005
- Sudbury Population: 17343
- Tewksbury Population: 29326
- Townsend Population: 1128
- Tyngsboro Population: 11366
- Waban
- Wakefield Population: 24932
- Waltham Population: 60632
- Wilmington Population: 22325
- Winchester Population: 21374
- Woburn Population: 38120
- Billerica Population: 39904
- Bleachery
- Boxboro
- Boxboro Station
- Braggville
- Braggville Station
- Brattle
- Brookside Station
- Browns Corner
- Burkinshaws Factory
- Burlington Population: 24498
- Burtts Crossing
- Cambridgeport
- Camp Bob White
- Camp Cabot
- Camp Cielo Celeste
- Camp Immaculate Heart
- Collinsville
- Concord Population: 16810
- Coolidge Hill
- Countryside
- Cummingsville
- Damons Mills Westvale
- Devenscrest
- Dracut Population: 28831
- Dunstable Population: 2878
- East Acton
- East Arlington
- East Billerica
- East Cambridge
- Eastview Park
- Follen Heights
- Forge Village
- Four Corners
- Fox Hill
- Framingham Population: 68318
- Framingham Center Population: 65413
- Frederick Corner
- Fuller Heights
- Gleasondale
- Gleasondale Station
- Glendale
- Glenwood
- Gooch Corners
- Graniteville
- Green Acres Trailer Park
- Greenwood
- Groton Population: 1124
- Kingston
- Lake Forest Park
- Lakeview
- Lexington Population: 31394
- Lincoln Population: 8197
- Linden
- Lindenwood
- Littleton Population: 2789
- Lokerville
- Long Pond Park
- Lower Village
- Malden Population: 59450
- Malden Centre
- Malden Highlands
- Meadowbrook Mobile Home Park
- Natick Population: 32276
- Newton Population: 85146
- Newton Center
- Newton Corner
- Newton Highlands
- Newton Lower Falls
- Newton Upper Falls
- Newtonville
- Nine Acre Corner
- Nobscot
- Nonantum
- Norris Corner
- North Acton
- North Billerica
- North Cambridge
- North Chelmsford
- North Lexington
- North Natick
- North Pepperell
- North Reading Population: 14101
- North Shirley
- North Sudbury
- North Tewksbury
- Sherborn Population: 4273
- Shirley Population: 1441
- Somerville Population: 75754
- South Acton
- Watertown Population: 31915
- Waverley
- Wayland Population: 13155
- West Concord Population: 6028
- West Newton
- Westford Population: 21587
- Weston Population: 11682
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