City | 2024 Population |
|---|---|
| Oak | 237 |
| Oak Hill | 25 |
| Oak Valley | 87 |
| Oaklawn-Sunview | 3,246 |
| Oakley | 1,964 |
| Oberlin | 1,595 |
| Odee | 32 |
| Odessa | 22 |
| Odin | 172 |
| Offerle | 161 |
| Ogallah | 14 |
| Ogden | 1,614 |
| Ohio | 753 |
| Oketo | 64 |
| Olathe | 149,419 |
| Olive | 49 |
| Olivet | 74 |
| Olmitz | 88 |
| Olpe | 518 |
| Olsburg | 223 |
| Omnia | 256 |
| Onaga | 673 |
| Oneida | 57 |
| Opolis | 22 |
| Orange | 52 |
| Orlando | 50 |
| Osage | 271 |
| Osage City | 2,800 |
| Osawatomie | 4,238 |
| Osborne | 1,296 |
| Oskaloosa | 1,074 |
| Oswego | 1,626 |
| Otis | 282 |
| Ottawa | 12,702 |
| Otter | 33 |
| Otter Creek | 156 |
| Ottumwa | 684 |
| Overbrook | 977 |
| Overland | 80 |
| Overland Park | 196,874 |
| Oxford | 1,041 |
| Ozark | 536 |
| Ozawkie | 624 |