8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Union City | 1 | 10,733 | 11,162 | -0.66% | 886 | 12 | City |
| South Fulton | 2 | 2,146 | 2,238 | -0.69% | 634 | 3 | City |
| Troy | 3 | 1,405 | 1,410 | -0.07% | 1,041 | 1 | Town |
| Obion | 4 | 955 | 994 | -0.62% | 740 | 1 | Town |
| Hornbeak | 5 | 503 | 509 | -0.2% | 479 | 1 | Town |
| Woodland Mills | 6 | 335 | 343 | -0.3% | 263 | 1 | City |
| Rives | 7 | 245 | 247 | 0% | 710 | 0 | Town |
| Samburg | 8 | 193 | 207 | -1.03% | 408 | 0 | Town |
Union City is the largest city in Obion County, with a population of 10,733.
Samburg is the smallest city in Obion County, with a population of 193.
There are 8 cities in Obion County, Tennessee.