3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Kingsport | 1 | 57,508 | 55,510 | 0.7% | 1,086 | 53 | City |
| Bristol | 2 | 28,038 | 27,181 | 0.61% | 857 | 33 | City |
| Bluff City | 3 | 1,842 | 1,819 | 0.22% | 1,054 | 2 | City |
Kingsport is the largest city in Sullivan County, with a population of 57,508.
Bluff City is the smallest city in Sullivan County, with a population of 1,842.
There are 3 cities in Sullivan County, Tennessee.