| Okaloosa County, FL (County) |
| Okanogan, WA (City) |
| Okanogan County, WA (County) |
| Okarche, OK (Town) |
| Okaton, SD (Township) |
| Okaw Township, IL (Township) |
| Okawville, IL (Village) |
| Okawville Township, IL (Township) |
| Okay, OK (Town) |
| Okeechobee , FL (City) |
| Okeechobee County, FL (County) |
| Okeene, OK (Town) |
| Okemah, OK (City) |
| Oketo, KS (City) |
| Oketo, KS (Township) |
