6 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Beaver Dam | 1 | 3,474 | 3,533 | -0.34% | 1,144 | 3.04 | City |
| Hartford | 2 | 2,634 | 2,666 | -0.23% | 928 | 2.84 | City |
| Fordsville | 3 | 443 | 443 | 0% | 989 | 0.45 | City |
| Centertown | 4 | 412 | 417 | -0.24% | 1,316 | 0.31 | City |
| Rockport | 5 | 257 | 261 | -0.39% | 370 | 0.69 | City |
| Rosine | 6 | 128 | 106 | 0.79% | 266 | 0.48 | CDP |
Beaver Dam is the largest city in Ohio County, with a population of 3,474.
Rosine is the smallest city in Ohio County.
There are 6 cities in Ohio County, Kentucky.