County ProfileNJ
Middlesex County
Population: 863,162 · 45 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
863,162
People
Median age
39.5
Housing
Total households
307,782
Income
Median household income
$111,549
Housing
Total housing units
317,979
Employment
Employment rate
62.7%
Education
Bachelor’s degree or higher
45.6%
Healthcare
Insured population
92.8%
County details
Local time 02:47:57(ET)| Name | Middlesex |
|---|---|
| Total ZIP codes | 45total |
| ZIP codes (by type) | 37 Standard6 PO Box2 Unique |
| Area code | 609, 640, 732, 848, 908 |
| Timezone | Eastern Time (ET) |
| Coordinates | 40.4396214, -74.4074303 |
| Land area | 309.3 sq miles(801.1 km²) |
Map of Middlesex county, New Jersey with ZIP codes
Cities and Communities in Middlesex County
Compare the largest cities in Middlesex County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Perth Amboy | 55,436 | $61,977 | 2ZIPs |
| New Brunswick | 55,266 | $65,810 | 5ZIPs |
| Sayreville | 45,345 | $99,979 | 2ZIPs |
| Old Bridge | 27,210 | $111,996 | 1ZIPs |
| Carteret | 25,326 | $96,862 | 1ZIPs |
| South Plainfield | 24,338 | $130,239 | 1ZIPs |
| Iselin | 20,088 | $109,500 | 1ZIPs |
| Woodbridge | 19,839 | $104,926 | 1ZIPs |
| Colonia | 18,609 | $122,713 | 1ZIPs |
| Avenel | 16,920 | $101,670 | 1ZIPs |
| South River | 16,118 | $96,147 | 1ZIPs |
| Highland Park | 15,072 | $104,694 | 1ZIPs |
| Metuchen | 15,049 | $158,052 | 1ZIPs |
| Middlesex | 14,636 | $105,000 | 1ZIPs |
| Fords | 12,941 | $115,861 | 1ZIPs |
| Kendall Park | 9,989 | $165,958 | 1ZIPs |
| South Amboy | 9,411 | $91,997 | 1ZIPs |
| Monmouth Junction | 8,895 | $133,585 | 1ZIPs |
| Spotswood | 8,163 | $105,060 | 1ZIPs |
| Dayton | 8,138 | $151,902 | 1ZIPs |
| Dunellen | 7,637 | $86,967 | 1ZIPs |
| Milltown | 7,037 | $140,960 | 1ZIPs |
| Port Reading | 3,921 | $134,479 | 1ZIPs |
| Keasbey | 3,027 | — | 1ZIPs |
| Sewaren | 2,885 | $108,948 | 1ZIPs |
| Helmetta | 2,455 | $98,952 | 1ZIPs |
| Cranbury | 2,200 | $224,200 | 1ZIPs |
| East Brunswick | — | — | 1ZIPs |
| Edison | — | — | 5ZIPs |
| Monroe Township | — | — | 1ZIPs |
| North Brunswick | — | — | 1ZIPs |
| Parlin | — | — | 1ZIPs |
| Piscataway | — | — | 2ZIPs |
| Plainsboro | — | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Middlesex County
Review the most populated postal areas across Middlesex County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 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 | — | — |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS