Decatur County's 2026 population is estimated at 11,902, reflecting a 0.69% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Decatur County is the 87th largest county in Tennessee. The 2010 population was 11,713 and has grown 1.61% since 2010.
Overall: 45.8 years
Female: 48.6 years
Male: 44.2 years
There are 9,244 adults, (2,756 of whom are seniors) in Decatur County.
Female: 5,730 (49.5%)
Male: 5,849 (50.5%)
The racial composition of Decatur County includes 91.48% White, and smaller percentages for Black or African American, Asian, other race, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 10,592 | 91.48% |
| Two or more races | 386 | 3.33% |
| Black or African American | 315 | 2.72% |
| Asian | 161 | 1.39% |
| Other race | 117 | 1.01% |
| Native American | 8 | 0.07% |
Decatur County 's average per capita income is $41,758. Household income levels show a median of $45,375. The poverty rate stands at 22.15%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $75,481 | - |
| Families | $61,360 | $76,315 |
| Households | $45,375 | $63,847 |
| Non Families | $26,078 | $36,712 |
Average Income
Median Household Income
Poverty Rate