8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Union City | 1 | 10,817 | 11,159 | -0.62% | 893 | 12.11 | City |
| South Fulton | 2 | 2,169 | 2,239 | -0.64% | 641 | 3.38 | City |
| Troy | 3 | 1,416 | 1,418 | 0% | 1,049 | 1.35 | Town |
| Obion | 4 | 965 | 992 | -0.52% | 748 | 1.29 | Town |
| Hornbeak | 5 | 503 | 510 | -0.2% | 479 | 1.05 | Town |
| Woodland Mills | 6 | 336 | 343 | -0.3% | 264 | 1.27 | City |
| Rives | 7 | 245 | 247 | 0% | 710 | 0.34 | Town |
| Samburg | 8 | 196 | 208 | -1.01% | 414 | 0.47 | Town |
Union City is the largest city in Obion County, with a population of 10,817.
Samburg is the smallest city in Obion County.
There are 8 cities in Obion County, Tennessee.