| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Kingsport | 1 | 57,947 | 55,510 | 0.72% | 1,094 | 53 | City |
| Bristol | 2 | 28,271 | 27,166 | 0.58% | 864 | 33 | City |
| Bluff City | 3 | 1,840 | 1,814 | 0.22% | 1,053 | 2 | City |
Kingsport is the largest city in Sullivan County, with a population of 57,947.
Bluff City is the smallest city in Sullivan County, with a population of 1,840.
There are 3 cities in Sullivan County, Tennessee.