3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ashland | 1 | 20,804 | 21,589 | -0.63% | 1,938 | 11 | City |
| Catlettsburg | 2 | 1,705 | 1,764 | -0.58% | 1,278 | 1 | City |
| Bellefonte | 3 | 868 | 912 | -0.8% | 985 | 1 | City |
Ashland is the largest city in Boyd County, with a population of 20,804.
Bellefonte is the smallest city in Boyd County, with a population of 868.
There are 3 cities in Boyd County, Kentucky.