Middlesex County, New Jersey
36 ZIP codes · 309.25 sq mi of land · FIPS 34023
| Population | 871,290 |
|---|---|
| State | New Jersey |
| FIPS code | 34023 |
| Time zone | Eastern |
| Land area | 309.25 sq mi |
| Center (lat, long) | 40.4396, -74.4074 |
Area codes in this area
These are the area codes that most often serve Middlesex County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Cities and towns (largest first)
New Brunswick · 56,345Perth Amboy · 55,855Sayreville · 45,838Old Bridge · 28,236Carteret · 25,496South Plainfield · 24,473Woodbridge · 20,756Iselin · 19,551Colonia · 18,587Avenel · 17,121South River · 16,124Metuchen · 15,144Highland Park · 15,121Middlesex · 14,645Port ReadingSewarenMatawanCranburyPlainsboroDaytonEast BrunswickEdisonKendall ParkHelmettaMonroe TownshipKeasbeyMilltownMonmouth JunctionPiscatawayParlin
ZIP codes in Middlesex County
07001 Avenel07008 Carteret07064 Port Reading07067 Colonia07077 Sewaren07080 South Plainfield07095 Woodbridge07747 Matawan08512 Cranbury08536 Plainsboro08810 Dayton08816 East Brunswick08817 Edison08820 Edison08824 Kendall Park08828 Helmetta08830 Iselin08831 Monroe Township08832 Keasbey08837 Edison08840 Metuchen08846 Middlesex08850 Milltown08852 Monmouth Junction08854 Piscataway08857 Old Bridge08859 Parlin08861 Perth Amboy08863 Fords08872 Sayreville08879 South Amboy08882 South River08884 Spotswood08901 New Brunswick08902 North Brunswick08904 Highland Park
Population: U.S. Census Bureau, ACS 5-year estimates, 2024.