Middlesex County, Massachusetts Zip Codes
| Malden | 65,463 |
| Medford | 63,873 |
| Everett | 48,685 |
| Marlborough | 41,391 |
| Woburn | 40,992 |
| Cambridge | 39,856 |
| Framingham | 38,898 |
| Cambridge | 38,006 |
| Lowell | 36,546 |
| Natick | 36,274 |
| Watertown | 35,300 |
| Framingham | 32,973 |
| Lowell | 32,323 |
| Dracut | 32,309 |
| Billerica | 30,854 |
| Tewksbury | 30,817 |
| Waltham | 30,365 |
| Melrose | 29,477 |
| Lowell | 29,062 |
| Arlington | 28,167 |
| Somerville | 27,692 |
| Wakefield | 27,026 |
| Belmont | 26,964 |
| Chelmsford | 26,612 |
| Burlington | 26,004 |
| Reading | 25,443 |
| Somerville | 25,329 |
| Somerville | 25,022 |
| Westford | 24,524 |
| Wilmington | 23,191 |
| Acton | 23,081 |
| Stoneham | 22,992 |
| Winchester | 22,809 |
| Cambridge | 21,553 |
| Hudson | 19,947 |
| Newton Center | 19,182 |
| Sudbury | 18,926 |
| Hopkinton | 18,748 |
| Ashland | 18,634 |
| Waltham | 18,379 |
| Concord | 18,311 |
| Lexington | 17,865 |
| Arlington | 17,739 |
| Lowell | 16,806 |
| Lexington | 16,356 |
| Waltham | 15,830 |
| North Reading | 15,529 |
| Holliston | 14,902 |
| Bedford | 14,408 |
| Cambridge | 14,402 |
| Wayland | 14,070 |
| Newton | 12,706 |
| Tyngsboro | 12,385 |
| West Newton | 11,823 |
| Weston | 11,759 |
| Pepperell | 11,667 |
| Groton | 11,212 |
| North Billerica | 11,126 |
| Maynard | 10,671 |
| Littleton | 10,084 |
| Newtonville | 9,888 |
| North Chelmsford | 9,570 |
| Auburndale | 8,859 |
| Ayer | 8,118 |
| Townsend | 7,168 |
| Stow | 7,111 |
| Shirley | 7,092 |
| Newton Highlands | 7,049 |
| Waban | 5,589 |
| Boxborough | 5,462 |
| Lincoln | 5,216 |
| Carlisle | 5,209 |
| Cambridge | 4,474 |
| Sherborn | 4,404 |
| Newton Upper Falls | 3,440 |
| Dunstable | 3,359 |
| Ashby | 3,187 |
| West Townsend | 1,902 |
| Hanscom Afb | 1,784 |
| Newton Lower Falls | 1,438 |
| Acton | 737 |
- Population is the most recent figure from the U.S. Census Bureau's 2022 American Community Survey (ACS) 5-Year Estimates.