County · New Jersey · United States
Middlesex County ZIP codes
36 ZIP codes · 34 cities · FIPS 34023
Key facts
- State
- New Jersey (NJ)
- FIPS code
- 34023
- Population
- 861,535
- Median household income
- $109,028
- Median age
- 39.4
- Land area
- 309.2 sq mi (800.9 km²)
- Population density
- 2,786 / sq mi
- Area codes
- 609, 640, 732, 848, 908
Cities and ZIP codes in Middlesex County (34)
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.