Sullivan County's 2026 population is estimated at 164,001, reflecting a 0.4% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Sullivan County is the 10th largest county in Tennessee. The 2010 population was 156,756 and has grown 4.62% since 2010.
Data after 2023 is projected based on recent change
Overall: 45 years
Female: 46.3 years
Male: 43.6 years
There are 130,014 adults, (35,721 of whom are seniors) in Sullivan County.
Female: 81,978 (51%)
Male: 78,646 (49%)
The racial composition of Sullivan County includes 92.43% White, and smaller percentages for Black or African American, Asian, other race, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 148,461 | 92.43% |
| Two or more races | 6,331 | 3.94% |
| Black or African American | 3,307 | 2.06% |
| Asian | 1,204 | 0.75% |
| Other race | 1,143 | 0.71% |
| Native American | 178 | 0.11% |
Sullivan County 's average per capita income is $43,361. Household income levels show a median of $58,807. The poverty rate stands at 15.43%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $92,512 | $116,380 |
| Families | $78,264 | $100,152 |
| Households | $58,807 | $82,467 |
| Non Families | $35,250 | $48,904 |
Average Income
Median Household Income
Poverty Rate