Middlesex County, Massachusetts
Middlesex County is a county in Massachusetts. Its county FIPS code is 25017. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 25017
- Representative coordinates
- 42.481721, -71.394916
- County type
- County
- County seat or government
- Cambridge, Lowell
- Resident population, July 2025
- 1,669,979
- Land area
- 2,118.363 km²
- Water area
- 75.22 km²
- State
- Massachusetts
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Middlesex County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/New_York | UTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
01431 · 01432 · 01434 · 01450 · 01460 · 01463 · 01464 · 01469 · 01474 · 01701 · 01702 · 01718 · 01719 · 01720 · 01721 · 01730 · 01731 · 01741 · 01742 · 01746 · 01748 · 01749 · 01752 · 01754 · 01760 · 01770 · 01773 · 01775 · 01776 · 01778 · 01801 · 01803 · 01821 · 01824 · 01826 · 01827 · 01850 · 01851 · 01852 · 01854 · 01862 · 01863 · 01864 · 01867 · 01876 · 01879 · 01880 · 01886 · 01887 · 01890 · 01940 · 02053 · 02138 · 02139 · 02140 · 02141 · 02142 · 02143 · 02144 · 02145 · 02148 · 02149 · 02155 · 02176 · 02180 · 02420 · 02421 · 02451 · 02452 · 02453 · 02458 · 02459 · 02460 · 02461 · 02462 · 02464 · 02465 · 02466 · 02467 · 02468 · 02472 · 02474 · 02476 · 02478 · 02493
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Arlington CDP, MA
- Ayer CDP, MA
- Belmont CDP, MA
- Burlington CDP, MA
- Cambridge city, MA
- Cochituate CDP, MA
- Devens CDP, MA
- East Pepperell CDP, MA
- Everett city, MA
- Framingham city, MA
- Groton CDP, MA
- Hanscom AFB CDP, MA
- Hopkinton CDP, MA
- Hudson CDP, MA
- Lexington CDP, MA
- Littleton Common CDP, MA
- Lowell city, MA
- Malden city, MA
- Marlborough city, MA
- Maynard CDP, MA
- Medford city, MA
- Melrose city, MA
- Newton city, MA
- Pepperell CDP, MA
- Pinehurst CDP, MA
- Reading CDP, MA
- Shirley CDP, MA
- Somerville city, MA
- Stoneham CDP, MA
- Townsend CDP, MA
Browse all cities, towns and communities for Middlesex County
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.
Small boundary contacts to check
These maps have small contacts that do not confidently establish another jurisdiction or clock zone. They remain separate from the main answer. Check a precise address near the line with the responsible authority.