Mercer County's estimated 2026 population is 401,249 with a growth rate of 0.49% in the past year according to the most recent United States census data. Mercer County is the 12th largest county in New Jersey. The 2010 population was 367,717 and has seen a growth of 9.12% since that time.
Data after 2023 is projected based on recent change
Overall: 39.5 years
Female: 40.8 years
Male: 38 years
There are 301,036 adults, (61,557 of whom are seniors) in Mercer County.
Female: 195,136 (50.6%)
Male: 190,728 (49.4%)
The racial composition of Mercer County includes 46.22% White, 18.45% Black or African American, 12.44% Asian, 10.76% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 178,342 | 46.22% |
| Black or African American | 71,211 | 18.45% |
| Asian | 48,018 | 12.44% |
| Other race | 41,518 | 10.76% |
| Two or more races | 41,493 | 10.75% |
| Native American | 5,214 | 1.35% |
| Native Hawaiian or Pacific Islander | 68 | 0.02% |
Mercer County's average per capita income is $60,967. Household income levels show a median of $100,645. The poverty rate stands at 10.27%.
Name | Median | Mean |
|---|---|---|
| Married Families | $157,064 | $207,561 |
| Families | $127,747 | $172,652 |
| Households | $100,645 | $142,368 |
| Non Families | $55,531 | $78,877 |
Average Income
Median Household Income
Poverty Rate