28 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Overland Park | Johnson County | 196,659 |
| Olathe | Johnson County | 151,377 |
| Ottawa | Franklin County | 12,718 |
| Osawatomie | Miami County | 4,235 |
| Oaklawn-Sunview | Sedgwick County | 2,911 |
| Osage City | Osage County | 2,787 |
| Oakley | Logan County | 1,946 |
| Oswego | Labette County | 1,616 |
| Ogden | Riley County | 1,601 |
| Oberlin | Decatur County | 1,585 |
| Osborne | Osborne County | 1,289 |
| Oskaloosa | Jefferson County | 1,068 |
| Oxford | Sumner County | 1,040 |
| Overbrook | Osage County | 970 |
| Onaga | Pottawatomie County | 671 |
| Ozawkie | Jefferson County | 621 |
| Olpe | Lyon County | 518 |
| Otis | Rush County | 278 |
| Olsburg | Pottawatomie County | 224 |
| Offerle | Edwards County | 157 |
| Odin | Barton County | 138 |
| Olmitz | Barton County | 87 |
| Olivet | Coffey County | 75 |
| Oketo | Marshall County | 64 |
| Oneida | Nemaha County | 57 |
| Oak Hill | Clay County | 25 |
| Ogallah | Trego County | 15 |
| Opolis | Crawford County | 14 |