| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| New Albany | 1 | 7,784 | 7,632 | 0.36% | 427 | 18 | City |
| Myrtle | 2 | 488 | 481 | 0.21% | 234 | 2 | Town |
| Blue Springs | 3 | 447 | 437 | 0.22% | 100 | 4 | Village |
New Albany is the largest city in Union County, with a population of 7,784.
Blue Springs is the smallest city in Union County, with a population of 447.
There are 3 cities in Union County, Mississippi.