8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Union City | 1 | 10,804 | 11,162 | -0.66% | 892 | 12 | City |
| South Fulton | 2 | 2,161 | 2,238 | -0.73% | 639 | 3 | City |
| Troy | 3 | 1,406 | 1,410 | -0.07% | 1,041 | 1 | Town |
| Obion | 4 | 961 | 994 | -0.72% | 745 | 1 | Town |
| Hornbeak | 5 | 504 | 509 | -0.2% | 480 | 1 | Town |
| Woodland Mills | 6 | 336 | 343 | -0.59% | 264 | 1 | City |
| Rives | 7 | 245 | 247 | -0.41% | 710 | 0 | Town |
| Samburg | 8 | 195 | 207 | -1.52% | 412 | 0 | Town |
Union City is the largest city in Obion County, with a population of 10,804.
Samburg is the smallest city in Obion County, with a population of 195.
There are 8 cities in Obion County, Tennessee.