| Name | Mercer County |
| State | New Jersey |
| FIPS Code | 34021 |
| County Seat | Trenton |
| Timezone | Eastern Standard Time (EST) |
| Population (2022) | 366,442 |
| Population Growth Rate(2000-2022) | 5.68% |
| Majority Ethnicity | White 62.53% |
| Public School Majority Ethnicity | Hispanic 36% |
| Partisan Voting Index | Strongly Democratic:+22 |
| Unemployment Rate (January 2025) | 3.6% |
| Area Code(s) | 609 / 640 / |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 62.53% |
| African American | 22.92% |
| Hispanic | 0.31% |
| Asian | 14.17% |
| Native American | 0.03% |
| Hawaiin/Pacific Islander | 0.03% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 25.54% |
| African American | 19.74% |
| Hispanic | 36.4% |
| Asian | 14.77% |
| Native American | 0.09% |
| Hawaiin/Pacific Islander | 0.09% |