Middlesex County ZIP Codes
Middlesex County is a county of New Jersey.
- ZIP codes
- 45
- Cities & towns
- 34
- Area codes
- 5
- Land area
- 309 sq mi
Every ZIP code in Middlesex County
| ZIP code | City |
|---|---|
| 07001 | Avenel |
| 07008 | Carteret |
| 07064 | Port Reading |
| 07067 | Colonia |
| 07077 | Sewaren |
| 07080 | South Plainfield |
| 07095 | Woodbridge |
| 08512 | Cranbury |
| 08536 | Plainsboro |
| 08810 | Dayton |
| 08812 | Dunellen |
| 08816 | East Brunswick |
| 08817 | Edison |
| 08818 | Edison |
| 08820 | Edison |
| 08824 | Kendall Park |
| 08828 | Helmetta |
| 08830 | Iselin |
| 08831 | Monroe Township |
| 08832 | Keasbey |
| 08837 | Edison |
| 08840 | Metuchen |
| 08846 | Middlesex |
| 08850 | Milltown |
| 08852 | Monmouth Junction |
| 08854 | Piscataway |
| 08855 | Piscataway |
| 08857 | Old Bridge |
| 08859 | Parlin |
| 08861 | Perth Amboy |
| 08862 | Perth Amboy |
| 08863 | Fords |
| 08871 | Sayreville |
| 08872 | Sayreville |
| 08879 | South Amboy |
| 08882 | South River |
| 08884 | Spotswood |
| 08899 | Edison |
| 08901 | New Brunswick |
| 08902 | North Brunswick |
| 08903 | New Brunswick |
| 08904 | Highland Park |
| 08906 | New Brunswick |
| 08933 | New Brunswick |
| 08989 | New Brunswick |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Middlesex County codes above are listed without a column we would have to invent.
Cities and towns in Middlesex County
A further 17 places in Middlesex County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.
Area codes covering Middlesex County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where Middlesex County's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in Middlesex County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.