Union County's 2026 population is estimated at 16,926, reflecting a 0.12% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Union County is the 60th largest county in Illinois. The 2010 population was 17,729 and has grown -4.53% since 2010.
Data after 2023 is projected based on recent change
Overall: 44.3 years
Female: 44.9 years
Male: 43.5 years
There are 13,380 adults, (3,899 of whom are seniors) in Union County.
Female: 8,346 (49.1%)
Male: 8,651 (50.9%)
The racial composition of Union County includes 89.49% White, and smaller percentages for Black or African American, Asian, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 15,210 | 89.49% |
| Two or more races | 1,437 | 8.45% |
| Black or African American | 161 | 0.95% |
| Asian | 108 | 0.64% |
| Other race | 43 | 0.25% |
| Native American | 23 | 0.14% |
| Native Hawaiian or Pacific Islander | 15 | 0.09% |
Union County 's average per capita income is $45,356. Household income levels show a median of $55,728. The poverty rate stands at 20.22%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $92,809 | - |
| Families | $84,901 | $95,447 |
| Households | $55,728 | $75,826 |
| Non Families | $28,408 | $42,707 |
Average Income
Median Household Income
Poverty Rate
