Union County's 2026 population is estimated at 74,909, reflecting a 1.99% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Union County is the 34th largest county in Ohio. The 2010 population was 52,462 and has grown 42.79% since 2010.
Overall: 38.5 years
Female: 39.1 years
Male: 37.8 years
There are 51,076 adults, (8,889 of whom are seniors) in Union County.
Female: 34,647 (51.5%)
Male: 32,677 (48.5%)
The racial composition of Union County includes 85.15% White, 5.01% Asian, and smaller percentages for Black or African American, other race, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 57,329 | 85.15% |
| Two or more races | 4,050 | 6.02% |
| Asian | 3,375 | 5.01% |
| Black or African American | 1,550 | 2.3% |
| Other race | 930 | 1.38% |
| Native American | 90 | 0.13% |
Union County 's average per capita income is $63,025. Household income levels show a median of $112,322. The poverty rate stands at 4.99%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $142,729 | $173,029 |
| Families | $129,446 | $156,391 |
| Households | $112,322 | $137,663 |
| Non Families | $58,390 | $75,376 |
Average Income
Median Household Income
Poverty Rate