Mercer County's 2026 population is estimated at 107,382, reflecting a -0.35% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Mercer County is the 31st largest county in Pennsylvania. The 2010 population was 116,607 and has grown -7.91% since 2010.
Data after 2023 is projected based on recent change
Overall: 45.1 years
Female: 47.3 years
Male: 43 years
There are 88,565 adults, (25,271 of whom are seniors) in Mercer County.
Female: 55,086 (50.4%)
Male: 54,171 (49.6%)
The racial composition of Mercer County includes 88.08% White, 5.82% Black or African American, and smaller percentages for other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 96,236 | 88.08% |
| Black or African American | 6,358 | 5.82% |
| Two or more races | 4,923 | 4.51% |
| Other race | 910 | 0.83% |
| Asian | 709 | 0.65% |
| Native American | 102 | 0.09% |
| Native Hawaiian or Pacific Islander | 19 | 0.02% |
Mercer County 's average per capita income is $45,755. Household income levels show a median of $59,976. The poverty rate stands at 13.16%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $92,197 | $110,416 |
| Families | $78,354 | $96,992 |
| Households | $59,976 | $79,381 |
| Non Families | $34,582 | $46,528 |
Average Income
Median Household Income
Poverty Rate