County · Massachusetts · United States
Middlesex County ZIP codes
82 ZIP codes · 67 cities · FIPS 25017
Key facts
- State
- Massachusetts (MA)
- FIPS code
- 25017
- Population
- 1,622,896
- Median household income
- $126,779
- Median age
- 38.9
- Land area
- 817.9 sq mi (2,118.2 km²)
- Population density
- 1,984 / sq mi
- Area codes
- 339, 351, 508, 617, 774, 781, 857, 978
Cities and ZIP codes in Middlesex County (67)
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.