3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Harrodsburg | 1 | 9,570 | 9,172 | 0.83% | 1,383 | 7 | City |
| Burgin | 2 | 1,025 | 982 | 0.79% | 816 | 1 | City |
| Salvisa | 3 | 218 | 167 | -5.63% | 118 | 2 | CDP |
Harrodsburg is the largest city in Mercer County, with a population of 9,570.
Salvisa is the smallest city in Mercer County, with a population of 218.
There are 3 cities in Mercer County, Kentucky.