9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Elizabethtown | 1 | 34,024 | 31,408 | 1.56% | 1,218 | 27.94 | City |
| Radcliff | 2 | 22,565 | 23,025 | -0.41% | 1,690 | 13.36 | City |
| Fort Knox | 3 | 8,288 | 8,865 | -1.45% | 408 | 20.29 | CDP |
| Vine Grove | 4 | 7,108 | 6,605 | 1.44% | 1,035 | 6.87 | City |
| Rineyville | 5 | 3,758 | 2,407 | 7.16% | 823 | 4.57 | CDP |
| West Point | 6 | 915 | 950 | -0.76% | 343 | 2.66 | City |
| Upton | 7 | 711 | 706 | 0.14% | 524 | 1.36 | City |
| Sonora | 8 | 563 | 567 | -0.18% | 415 | 1.36 | City |
| Cecilia | 9 | 406 | 552 | -2.64% | 284 | 1.43 | CDP |
Elizabethtown is the largest city in Hardin County, with a population of 34,024.
Cecilia is the smallest city in Hardin County.
There are 9 cities in Hardin County, Kentucky.