28 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Overland Park | Johnson County | 204,153 |
| Olathe | Johnson County | 150,903 |
| Ottawa | Franklin County | 12,758 |
| Osawatomie | Miami County | 4,187 |
| Oaklawn-Sunview | Sedgwick County | 2,911 |
| Osage City | Osage County | 2,784 |
| Oakley | Logan County | 1,987 |
| Ogden | Riley County | 1,653 |
| Oswego | Labette County | 1,616 |
| Oberlin | Decatur County | 1,605 |
| Osborne | Osborne County | 1,262 |
| Oskaloosa | Jefferson County | 1,066 |
| Oxford | Sumner County | 1,034 |
| Overbrook | Osage County | 990 |
| Onaga | Pottawatomie County | 681 |
| Ozawkie | Jefferson County | 620 |
| Olpe | Lyon County | 531 |
| Otis | Rush County | 278 |
| Olsburg | Pottawatomie County | 227 |
| Offerle | Edwards County | 160 |
| Odin | Barton County | 138 |
| Olmitz | Barton County | 89 |
| Olivet | Coffey County | 74 |
| Oketo | Marshall County | 61 |
| Oneida | Nemaha County | 57 |
| Oak Hill | Clay County | 25 |
| Ogallah | Trego County | 15 |
| Opolis | Crawford County | 14 |