15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Andover | 1 | 16,380 | 14,965 | 1.76% | 1,573 | 10.41 | City |
| El Dorado | 2 | 12,962 | 12,854 | 0.17% | 1,354 | 9.58 | City |
| Augusta | 3 | 9,249 | 9,239 | 0.02% | 2,180 | 4.24 | City |
| Rose Hill | 4 | 4,427 | 4,189 | 1.1% | 1,962 | 2.26 | City |
| Douglass | 5 | 1,537 | 1,549 | -0.13% | 1,447 | 1.06 | City |
| Towanda | 6 | 1,435 | 1,445 | -0.14% | 1,570 | 0.91 | City |
| Benton | 7 | 945 | 944 | 0% | 676 | 1.40 | City |
| Leon | 8 | 666 | 656 | 0.3% | 921 | 0.72 | City |
| Whitewater | 9 | 666 | 660 | 0.15% | 1,620 | 0.41 | City |
| Potwin | 10 | 421 | 423 | 0% | 1,791 | 0.23 | City |
| Elbing | 11 | 223 | 225 | 0% | 1,297 | 0.17 | City |
| Rosalia | 12 | 147 | 100 | -1.34% | 116 | 1.27 | CDP |
| Cassoday | 13 | 111 | 110 | 0% | 326 | 0.34 | City |
| Latham | 14 | 100 | 99 | 0% | 461 | 0.22 | City |
| Beaumont | 15 | 50 | 29 | 6.38% | 90 | 0.55 | CDP |
Andover is the largest city in Butler County, with a population of 16,380.
Beaumont is the smallest city in Butler County.
There are 15 cities in Butler County, Kansas.