Mercer County, New Jersey
Mercer County, New Jersey, had an estimated population of 399,289 in 2025 across 581 km². The figures below come from the US Census Bureau's population estimates and the American Community Survey, each shown with its own vintage and its rank among New Jersey's counties and nationally.
- Population
- 399,289
- 2025 estimate
- Area
- 581 km²
- Density
- 687
- per km²
- Median income
- $100,645
- household, ACS 2024
- Median age
- 39.5
- years, ACS 2024
How New Jersey's counties spread
Amenities & Infrastructure
| Indicator | Value | In New Jersey | In the US |
|---|---|---|---|
| Households with Broadband2024 | 91.4% | 16 / 21 | 531 / 3,144 |
| Median Gross Rent2024 | $1,623 | 11 / 21 | 171 / 3,137 |
| Median Home Value2024 | $377,700 | 13 / 21 | 346 / 3,139 |
| Owner-Occupied Homes2024 | 62.2% | 17 / 21 | 2,819 / 3,144 |
| Vacant Homes2024 | 4.6% | 12 / 21 | 3,012 / 3,144 |
Demography
| Indicator | Value | In New Jersey | In the US |
|---|---|---|---|
| Aged 65 and Over2024 | 16.0% | 16 / 21 | 2,613 / 3,144 |
| American Indian & Alaska Native2024 | 0.1% | 3 / 21 | 1,566 / 3,144 |
| Asian, non-Hispanic2024 | 12.3% | 5 / 21 | 45 / 3,144 |
| Average Household Size2024people | 2.6 | 14 / 21 | 783 / 3,144 |
| Black, non-Hispanic2024 | 17.9% | 3 / 21 | 516 / 3,144 |
| Foreign-Born2024 | 27.0% | 8 / 21 | 46 / 3,144 |
| Hispanic or Latino2024 | 23.1% | 7 / 21 | 371 / 3,144 |
| Median Age2024years | 39.5 | 14 / 21 | 2,169 / 3,144 |
| Sex Ratio2024per 1,000 males | 1,023 | 15 / 21 | 982 / 3,144 |
| Speak a Language Other Than English2024 | 35.7% | 7 / 21 | 145 / 3,144 |
| Under 182024 | 22.0% | 7 / 21 | 1,479 / 3,144 |
| Veterans2024 | 3.4% | 13 / 21 | 3,056 / 3,144 |
| White, non-Hispanic2024 | 42.7% | 15 / 21 | 2,833 / 3,144 |
Economy
| Indicator | Value | In New Jersey | In the US |
|---|---|---|---|
| Below Poverty Line2024 | 10.3% | 9 / 21 | 2,275 / 3,144 |
| Households on SNAP2024 | 9.3% | 8 / 21 | 2,072 / 3,144 |
| Income Inequality2024index | 0.493 | 3 / 21 | 341 / 3,144 |
| Median Household Income2024 | $100,645 | 12 / 21 | 166 / 3,143 |
| Per Capita Income2024 | $53,765 | 10 / 21 | 147 / 3,144 |
| Unemployment Rate2024 | 6.3% | 9 / 21 | 533 / 3,144 |
Education
| Indicator | Value | In New Jersey | In the US |
|---|---|---|---|
| Bachelor's Degree or Higher2024 | 45.4% | 8 / 21 | 166 / 3,144 |
| High School or Higher2024 | 89.4% | 14 / 21 | 1,760 / 3,144 |
Health Coverage
| Indicator | Value | In New Jersey | In the US |
|---|---|---|---|
| No Health Insurance2024 | 7.9% | 6 / 21 | 1,547 / 3,144 |
| With a Disability2024 | 10.7% | 12 / 21 | 2,921 / 3,144 |
Population & Density
| Indicator | Value | In New Jersey | In the US |
|---|---|---|---|
| Population2025 | 399,289 | 12 / 21 | 196 / 3,144 |
| Population Density2025/km² | 687 | 8 / 21 | 83 / 3,144 |
Work & Commute
| Indicator | Value | In New Jersey | In the US |
|---|---|---|---|
| Commute by Public Transit2024 | 4.6% | 8 / 21 | 59 / 3,144 |
| Households with No Vehicle2024 | 11.2% | 4 / 21 | 154 / 3,144 |
| Mean Commute Time2024minutes | 27.1 | 16 / 21 | 919 / 3,143 |
| Work from Home2024 | 19.5% | 5 / 21 | 151 / 3,144 |
Other counties of New Jersey
Compare Mercer County against every other county on a map, add layers and run a scatter — open the atlas. Sources and vintages for every figure on this page are listed under datasets, or browse all 3,144 counties.