| Oberst | |
| Öbeste | |
| Obion County | |
| O’Brien County | |
| obschoons | |
| obstinatsch | |
| Oceana County | |
| Ocean County | |
| Oche | |
| Ochiltree County | |
| Oconee County | |
| Oconto County | |
| Odense | |
| Oder | |
| oder | |
| Odoaker | |
| Oederquart | |
| Oelfke | |
| Oerel | |
| Oer-Erkenswick | |
| ofschoonst | |
| oftins | |
| Ogemaw County | |
| Ogen | |
| Ogenblick m | |
| Ogle County | |
| Oglethorpe County | |
| Ohaueha | |
| Ohio | |
| Ohio County | |
| Ohlers | |
| öhmen | |
| Ohr | |
| Ohr n | |
| Oh Uganda | |
| Oirschot | |
| Oise | |
| ok | |
| Okaloosa County | |
| Okanogan County | |
| Okeechobee County | |
| Ökelnaam | |
| Okfuskee County | |
| Oklahoma | |
| Oklahoma County | |
| Okmulgee County | |
| ökonoomsch | |
| oksitaansch | |
| Oksitanien | |
| Oktant | |
| Plattdüütsch |