| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Morganfield | 1 | 3,068 | 3,248 | -1.1% | 1,090 | 3 | City |
| Sturgis | 2 | 1,615 | 1,733 | -1.34% | 1,031 | 2 | City |
| Uniontown | 3 | 893 | 929 | -0.89% | 1,051 | 1 | City |
| Waverly | 4 | 298 | 313 | -1% | 1,116 | 0 | City |
Morganfield is the largest city in Union County, with a population of 3,068.
Waverly is the smallest city in Union County, with a population of 298.
There are 4 cities in Union County, Kentucky.