| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O'Brien | city | Kansas | United States | 38.51 | -95.03 | 895 | |
| Oak Court Mobile Home Court | city | Kansas | United States | 37.78 | -97.47 | 1669 | |
| Oak Hill | city | Kansas | United States | 39.25 | -97.34 | 1669 | |
| Oak Lane Mobile Home Park | city | Kansas | United States | 39.27 | -94.89 | 830 | |
| Oak Mills | city | Kansas | United States | 39.45 | -95.01 | 830 | |
| Oak Ridge Mobile Home Community | city | Kansas | United States | 37.69 | -96.96 | 1233 | |
| Oak Valley | city | Kansas | United States | 37.34 | -96.01 | 856 | |
| Oakland | city | Kansas | United States | 39.07 | -95.64 | 879 | |
| Oaklawn | city | Kansas | United States | 37.61 | -97.30 | 1669 | |
| Oakley | city | Kansas | United States | 39.13 | -100.86 | 3349 | |
| Oaks Mobile Home Park | city | Kansas | United States | 37.64 | -97.34 | 1669 | |
| Oakwood Manor Mobile Home Park | city | Kansas | United States | 37.60 | -97.33 | 1669 | |
| Oatville | city | Kansas | United States | 37.62 | -97.39 | 1669 | |
| Obeeville | city | Kansas | United States | 38.06 | -97.85 | 1669 | |
| Oberlin | city | Kansas | United States | 39.82 | -100.53 | 2559 | |
| Ocheltree | city | Kansas | United States | 38.77 | -94.82 | 1122 | |
| Odense | city | Kansas | United States | 37.70 | -95.25 | 1030 | |
| Odin | city | Kansas | United States | 38.57 | -98.61 | 1850 | |
| Offerle | city | Kansas | United States | 37.89 | -99.56 | 2509 | |
| Ogallah | city | Kansas | United States | 38.99 | -99.73 | 2509 | |
| Ogden | city | Kansas | United States | 39.11 | -96.71 | 1049 | |
| Oketo | city | Kansas | United States | 39.96 | -96.60 | 1669 | |
| Olathe | city | Kansas | United States | 38.88 | -94.82 | 1040 | |
| Olivet | city | Kansas | United States | 38.48 | -95.75 | 1122 | |
| Olmitz | city | Kansas | United States | 38.52 | -98.94 | 1998 | |
| Olpe | city | Kansas | United States | 38.26 | -96.17 | 1197 | |
| Olsburg | city | Kansas | United States | 39.43 | -96.62 | 1669 | |
| Onaga | city | Kansas | United States | 39.49 | -96.17 | 1095 | |
| Oneida | city | Kansas | United States | 39.86 | -95.94 | 1223 | |
| Oneonta (historical) | city | Kansas | United States | 39.65 | -97.88 | 1669 | |
| Ontario | city | Kansas | United States | 39.57 | -95.88 | 1164 | |
| Opolis | city | Kansas | United States | 37.34 | -94.62 | 915 | |
| Orchard Park | city | Kansas | United States | 37.36 | -95.28 | 892 | |
| Orchard Park Mobile Home Park | city | Kansas | United States | 37.69 | -97.40 | 1669 | |
| Oronoque | city | Kansas | United States | 39.79 | -100.03 | 2509 | |
| Orsemus | city | Kansas | United States | 37.50 | -97.94 | 1669 | |
| Orwell | city | Kansas | United States | 38.02 | -99.72 | 2509 | |
| Osage City | city | Kansas | United States | 38.63 | -95.83 | 1115 | |
| Osawatomie | city | Kansas | United States | 38.50 | -94.95 | 839 | |
| Osborne | city | Kansas | United States | 39.44 | -98.69 | 1669 | |
| Oscar (historical) | city | Kansas | United States | 39.52 | -97.13 | 1669 | |
| Osgood | city | Kansas | United States | 38.66 | -99.84 | 2509 | |
| Oskaloosa | city | Kansas | United States | 39.22 | -95.31 | 1105 | |
| Osro | city | Kansas | United States | 37.07 | -96.44 | 898 | |
| Oswego | city | Kansas | United States | 37.17 | -95.11 | 908 | |
| Otego | city | Kansas | United States | 39.83 | -98.35 | 1781 | |
| Otis | city | Kansas | United States | 38.53 | -99.05 | 2043 | |
| Ottawa | city | Kansas | United States | 38.62 | -95.27 | 908 | |
| Ottawa Junction | city | Kansas | United States | 38.63 | -95.27 | 908 | |
| Ottumwa | city | Kansas | United States | 38.28 | -95.80 | 1066 | |
| Oursler | city | Kansas | United States | 38.29 | -96.98 | 1669 | |
| Overbrook | city | Kansas | United States | 38.78 | -95.56 | 1217 | |
| Overland Park | city | Kansas | United States | 38.98 | -94.67 | 1099 | |
| Owen | city | Kansas | United States | 37.00 | -95.93 | 830 | |
| Oxford | city | Kansas | United States | 37.27 | -97.17 | 1161 | |
| Ozawkie | city | Kansas | United States | 39.23 | -95.47 | 994 |