16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Thomas | 1 | 16,788 | 17,418 | -0.74% | 2,959 | 6 | City |
| Newport | 2 | 13,703 | 14,147 | -0.65% | 4,968 | 3 | City |
| Alexandria | 3 | 10,930 | 10,373 | 1.03% | 1,579 | 7 | City |
| Cold Spring | 4 | 6,567 | 6,225 | 1.05% | 1,383 | 5 | City |
| Highland Heights | 5 | 6,200 | 6,657 | -1.46% | 2,366 | 3 | City |
| Dayton | 6 | 5,902 | 5,662 | 0.82% | 4,543 | 1 | City |
| Bellevue | 7 | 5,785 | 5,549 | 0.82% | 6,392 | 1 | City |
| Southgate | 8 | 3,839 | 3,652 | 0.97% | 2,633 | 1 | City |
| Claryville | 9 | 3,616 | 2,896 | 2.38% | 502 | 7 | CDP |
| Wilder | 10 | 3,070 | 3,173 | -0.68% | 851 | 4 | City |
| Silver Grove | 11 | 1,223 | 1,162 | 0.99% | 1,082 | 1 | City |
| Melbourne | 12 | 476 | 456 | 0.85% | 570 | 1 | City |
| Crestview | 13 | 469 | 449 | 0.86% | 2,968 | 0 | City |
| Mentor | 14 | 229 | 216 | 0.88% | 307 | 1 | City |
| Woodlawn | 15 | 227 | 220 | 0.44% | 3,847 | 0 | City |
| California | 16 | 86 | 81 | 1.18% | 391 | 0 | City |
Fort Thomas is the largest city in Campbell County, with a population of 16,788.
California is the smallest city in Campbell County, with a population of 86.
There are 16 cities in Campbell County, Kentucky.