9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Boone | 1 | 12,392 | 12,452 | -0.1% | 1,356 | 9.14 | City |
| Madrid | 2 | 2,797 | 2,801 | -0.04% | 2,285 | 1.22 | City |
| Ogden | 3 | 1,933 | 2,008 | -0.77% | 1,413 | 1.37 | City |
| Boxholm | 4 | 169 | 178 | -1.17% | 168 | 1 | City |
| Pilot Mound | 5 | 156 | 161 | -0.64% | 159 | 0.98 | City |
| Luther | 6 | 143 | 148 | -0.69% | 243 | 0.59 | City |
| Fraser | 7 | 102 | 102 | 0% | 90 | 1.14 | City |
| Beaver | 8 | 43 | 45 | 0% | 172 | 0.25 | City |
| Berkley | 9 | 20 | 22 | 0% | 100 | 0.20 | City |
Boone is the largest city in Boone County, with a population of 12,392.
Berkley is the smallest city in Boone County.
There are 9 cities in Boone County, Iowa.