6 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| New Albany | 1 | 7,754 | 7,623 | 0.32% | 425 | 18 | City |
| New Albany | 2 | 7,754 | 7,629 | 0.32% | 425 | 18 | City |
| Myrtle | 3 | 489 | 483 | 0.2% | 235 | 2 | Town |
| Myrtle | 4 | 489 | 483 | 0.2% | 235 | 2 | Town |
| Blue Springs | 5 | 440 | 434 | 0.23% | 98 | 4 | Village |
| Blue Springs | 6 | 440 | 434 | 0.23% | 98 | 4 | Village |
New Albany is the largest city in Union County, with a population of 7,754.
Blue Springs is the smallest city in Union County, with a population of 440.
There are 6 cities in Union County, Mississippi.