10 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wamego | 1 | 4,912 | 4,840 | 0.24% | 1,863 | 3 | City |
| St. Marys | 2 | 2,795 | 2,761 | 0.22% | 2,373 | 1 | City |
| St. George | 3 | 1,194 | 1,062 | 1.88% | 1,851 | 1 | City |
| Westmoreland | 4 | 734 | 727 | 0.14% | 1,492 | 0 | City |
| Onaga | 5 | 681 | 680 | 0% | 1,038 | 1 | City |
| Olsburg | 6 | 229 | 220 | 0.88% | 946 | 0 | City |
| Belvue | 7 | 220 | 178 | 3.29% | 1,789 | 0 | City |
| Emmett | 8 | 171 | 168 | 0.59% | 877 | 0 | City |
| Louisville | 9 | 160 | 136 | 2.56% | 321 | 0 | City |
| Havensville | 10 | 134 | 122 | 1.52% | 924 | 0 | City |
Wamego is the largest city in Pottawatomie County, with a population of 4,912.
Havensville is the smallest city in Pottawatomie County, with a population of 134.
There are 10 cities in Pottawatomie County, Kansas.