4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jamestown | 1 | 2,122 | 2,020 | 0.95% | 681 | 3 | City |
| Grimsley | 2 | 702 | 975 | -4.23% | 64 | 11 | CDP |
| Clarkrange | 3 | 686 | 794 | 1.03% | 68 | 10 | CDP |
| Allardt | 4 | 613 | 556 | 1.83% | 163 | 4 | City |
Jamestown is the largest city in Fentress County, with a population of 2,122.
Allardt is the smallest city in Fentress County, with a population of 613.
There are 4 cities in Fentress County, Tennessee.