| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Beaver Dam | 1 | 3,536 | 3,534 | -0.03% | 1,164 | 3 | City |
| Hartford | 2 | 2,663 | 2,665 | -0.08% | 939 | 3 | City |
| Fordsville | 3 | 453 | 442 | 0.44% | 1,011 | 0 | City |
| Centertown | 4 | 413 | 413 | 0% | 1,319 | 0 | City |
| Rockport | 5 | 265 | 264 | 0% | 381 | 1 | City |
Beaver Dam is the largest city in Ohio County, with a population of 3,536.
Rockport is the smallest city in Ohio County, with a population of 265.
There are 5 cities in Ohio County, Kentucky.