| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Union City | 1 | 10,744 | 11,171 | -0.65% | 887 | 12 | City |
| South Fulton | 2 | 2,142 | 2,241 | -0.74% | 633 | 3 | City |
| Troy | 3 | 1,397 | 1,410 | -0.14% | 1,035 | 1 | Town |
| Obion | 4 | 951 | 993 | -0.73% | 737 | 1 | Town |
| Hornbeak | 5 | 502 | 508 | -0.2% | 478 | 1 | Town |
| Woodland Mills | 6 | 332 | 342 | -0.6% | 261 | 1 | City |
| Rives | 7 | 243 | 247 | -0.41% | 704 | 0 | Town |
| Samburg | 8 | 195 | 208 | -1.52% | 412 | 0 | Town |
Union City is the largest city in Obion County, with a population of 10,744.
Samburg is the smallest city in Obion County, with a population of 195.
There are 8 cities in Obion County, Tennessee.