Union County's 2026 population is estimated at 21,698, reflecting a 1.48% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Union County is the 66th largest county in Tennessee. The 2010 population was 19,118 and has grown 13.5% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.7 years
Female: 42.9 years
Male: 42.1 years
There are 16,079 adults, (3,849 of whom are seniors) in Union County.
Female: 10,168 (49.8%)
Male: 10,263 (50.2%)
The racial composition of Union County includes 94.6% White, and smaller percentages for other race, Black or African American, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 19,327 | 94.6% |
| Two or more races | 936 | 4.58% |
| Other race | 87 | 0.43% |
| Black or African American | 70 | 0.34% |
| Asian | 11 | 0.05% |
Union County 's average per capita income is $43,906. Household income levels show a median of $62,727. The poverty rate stands at 13.8%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $81,483 | - |
| Families | $75,910 | $86,501 |
| Households | $62,727 | $75,767 |
| Non Families | $24,804 | $38,885 |
Average Income
Median Household Income
Poverty Rate