| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Thomas | 1 | 17,030 | 17,419 | -0.65% | 3,001 | 6 | City |
| Newport | 2 | 13,922 | 14,148 | -0.54% | 5,048 | 3 | City |
| Alexandria | 3 | 11,101 | 10,370 | 0.97% | 1,603 | 7 | City |
| Cold Spring | 4 | 6,703 | 6,259 | 0.95% | 1,412 | 5 | City |
| Highland Heights | 5 | 6,248 | 6,644 | -1.47% | 2,385 | 3 | City |
| Dayton | 6 | 6,026 | 5,671 | 0.87% | 4,639 | 1 | City |
| Bellevue | 7 | 5,898 | 5,547 | 0.87% | 6,517 | 1 | City |
| Southgate | 8 | 3,905 | 3,654 | 0.96% | 2,678 | 1 | City |
| Wilder | 9 | 3,084 | 3,173 | -0.77% | 855 | 4 | City |
| Silver Grove | 10 | 1,345 | 1,262 | 0.9% | 1,190 | 1 | City |
| Melbourne | 11 | 495 | 464 | 0.81% | 593 | 1 | City |
| Crestview | 12 | 479 | 449 | 0.84% | 3,032 | 0 | City |
| Mentor | 13 | 233 | 213 | 1.3% | 312 | 1 | City |
| Woodlawn | 14 | 232 | 218 | 0.87% | 3,932 | 0 | City |
| California | 15 | 89 | 81 | 1.14% | 405 | 0 | City |
Fort Thomas is the largest city in Campbell County, with a population of 17,030.
California is the smallest city in Campbell County, with a population of 89.
There are 15 cities in Campbell County, Kentucky.