| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wamego | 1 | 4,925 | 4,841 | 0.26% | 1,868 | 3 | City |
| St. Marys | 2 | 2,795 | 2,758 | 0.18% | 2,373 | 1 | City |
| St. George | 3 | 1,187 | 1,059 | 1.89% | 1,840 | 1 | City |
| Westmoreland | 4 | 748 | 732 | 0.13% | 1,520 | 0 | City |
| Onaga | 5 | 683 | 682 | 0% | 1,041 | 1 | City |
| Olsburg | 6 | 226 | 221 | 0.44% | 934 | 0 | City |
| Belvue | 7 | 213 | 178 | 3.4% | 1,732 | 0 | City |
| Emmett | 8 | 169 | 170 | -0.59% | 867 | 0 | City |
| Louisville | 9 | 154 | 134 | 1.99% | 309 | 0 | City |
| Havensville | 10 | 132 | 122 | 1.54% | 910 | 0 | City |
Wamego is the largest city in Pottawatomie County, with a population of 4,925.
Havensville is the smallest city in Pottawatomie County, with a population of 132.
There are 10 cities in Pottawatomie County, Kansas.