| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Maynardville | 1 | 2,753 | 2,478 | 1.1% | 510 | 5 | City |
| Luttrell | 2 | 1,138 | 1,023 | 1.79% | 289 | 4 | Town |
Maynardville is the largest city in Union County, with a population of 2,753.
Luttrell is the smallest city in Union County, with a population of 1,138.
There are 2 cities in Union County, Tennessee.