4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Morganfield | 1 | 3,070 | 3,253 | -0.97% | 1,091 | 3 | City |
| Sturgis | 2 | 1,612 | 1,740 | -1.29% | 1,029 | 2 | City |
| Uniontown | 3 | 876 | 927 | -0.9% | 1,031 | 1 | City |
| Waverly | 4 | 296 | 313 | -1% | 1,109 | 0 | City |
Morganfield is the largest city in Union County, with a population of 3,070.
Waverly is the smallest city in Union County, with a population of 296.
There are 4 cities in Union County, Kentucky.