There are 21 cities in Mahaska County, Iowa.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ottumwa | 1 | 25,184 | 25,455 | -0.27% | 1,568 | 16.1 | City |
| Oskaloosa | 2 | 11,418 | 11,537 | -0.26% | 1,418 | 8.1 | City |
| Pella | 3 | 10,937 | 10,467 | 1.08% | 1,171 | 9.3 | City |
| Montezuma | 4 | 1,428 | 1,444 | -0.28% | 578 | 2.5 | City |
| New Sharon | 5 | 1,243 | 1,258 | -0.32% | 1,324 | 0.9 | City |
| Eddyville | 6 | 954 | 968 | -0.42% | 831 | 1.1 | City |
| Sully | 7 | 886 | 880 | 0.11% | 1,522 | 0.6 | City |
| Fremont | 8 | 681 | 697 | -0.58% | 641 | 1.1 | City |
| What Cheer | 9 | 594 | 605 | -0.5% | 480 | 1.2 | City |
| University Park | 10 | 471 | 486 | -0.84% | 605 | 0.8 | City |
| Beacon | 11 | 430 | 434 | -0.23% | 553 | 0.8 | City |
| Lynnville | 12 | 383 | 381 | 0% | 348 | 1.1 | City |
| Bussey | 13 | 372 | 379 | -0.53% | 1,196 | 0.3 | City |
| Delta | 14 | 257 | 261 | -0.39% | 268 | 1.0 | City |
| Rose Hill | 15 | 156 | 160 | -0.64% | 1,099 | 0.1 | City |
| Barnes City | 16 | 150 | 154 | -0.66% | 255 | 0.6 | City |
| Leighton | 17 | 148 | 155 | -1.33% | 1,591 | 0.1 | City |
| Hamilton | 18 | 127 | 125 | 0% | 251 | 0.5 | City |
| Keomah Village | 19 | 108 | 111 | -0.92% | 1,714 | 0.1 | City |
| Chillicothe | 20 | 78 | 76 | 0% | 345 | 0.2 | City |
| Gibson | 21 | 57 | 59 | -1.72% | 905 | 0.1 | City |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Ottumwa is the largest city in Mahaska County.
Gibson is the smallest city in Mahaska County.
There are 21 cities in Mahaska County, Iowa.