Union County's 2026 population is estimated at 12,039, reflecting a 0.35% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Union County is the 63rd largest county in Iowa. The 2010 population was 12,513 and has grown -3.79% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.5 years
Female: 41.8 years
Male: 39.4 years
There are 9,296 adults, (2,490 of whom are seniors) in Union County.
Female: 6,015 (50.2%)
Male: 5,978 (49.8%)
The racial composition of Union County includes 92.81% White, and smaller percentages for Black or African American, other race, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 11,131 | 92.81% |
| Two or more races | 371 | 3.09% |
| Black or African American | 196 | 1.63% |
| Other race | 173 | 1.44% |
| Asian | 106 | 0.88% |
| Native American | 16 | 0.13% |
Union County 's average per capita income is $41,677. Household income levels show a median of $57,772. The poverty rate stands at 12.37%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $83,255 | - |
| Families | $77,098 | $89,041 |
| Households | $57,772 | $71,876 |
| Non Families | $38,574 | $46,899 |
Average Income
Median Household Income
Poverty Rate
