County ProfileNJ
Mercer County
Population: 387,340 · 38 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
387,340
People
Median age
39.5
Housing
Total households
144,114
Income
Median household income
$100,645
Housing
Total housing units
151,138
Employment
Employment rate
61.1%
Education
Bachelor’s degree or higher
45.4%
Healthcare
Insured population
92.1%
County details
Local time 04:27:07(ET)| Name | Mercer |
|---|---|
| Total ZIP codes | 38total |
| ZIP codes (by type) | 20 Standard11 PO Box7 Unique |
| Area code | 609, 640 |
| Timezone | Eastern Time (ET) |
| Coordinates | 40.2825026, -74.703724 |
| Land area | 224.5 sq miles(581.4 km²) |
Map of Mercer county, New Jersey with ZIP codes
Cities and Communities in Mercer County
Compare the largest cities in Mercer 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 |
|---|---|---|---|
| Trenton | 90,871 | $52,537 | 25ZIPs |
| Princeton | 30,681 | $192,079 | 5ZIPs |
| Hightstown | 5,900 | $108,987 | 1ZIPs |
| Pennington | 2,802 | $192,586 | 1ZIPs |
| Princeton Junction | 2,475 | $224,732 | 1ZIPs |
| Hopewell | 1,918 | $145,114 | 1ZIPs |
| Titusville | 633 | $120,234 | 1ZIPs |
| Windsor | 330 | — | 1ZIPs |
| Lawrence Township | — | — | 1ZIPs |
| Robbinsville | — | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Mercer County
Review the most populated postal areas across Mercer County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 08520 | Hightstown | — | — |
| 08525 | Hopewell | — | — |
| 08534 | Pennington | — | — |
| 08540 | Princeton | — | — |
| 08541 | Princeton | — | — |
| 08542 | Princeton | — | — |
| 08543 | Princeton | — | — |
| 08544 | Princeton | — | — |
| 08550 | Princeton Junction | — | — |
| 08560 | Titusville | — | — |
| 08561 | Windsor | — | — |
| 08601 | Trenton | — | — |
| 08602 | Trenton | — | — |
| 08603 | Trenton | — | — |
| 08604 | Trenton | — | — |
| 08605 | Trenton | — | — |
| 08606 | Trenton | — | — |
| 08607 | Trenton | — | — |
| 08608 | Trenton | — | — |
| 08609 | Trenton | — | — |
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