| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Shelbyville | 1 | 18,661 | 17,355 | 1.13% | 1,720 | 11 | City |
| Simpsonville | 2 | 3,220 | 2,989 | 1.16% | 970 | 3 | City |
Shelbyville is the largest city in Shelby County, with a population of 18,661.
Simpsonville is the smallest city in Shelby County, with a population of 3,220.
There are 2 cities in Shelby County, Kentucky.