| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oppenhausen | city | Rheinland-Pfalz | Germany | 50.20 | 7.48 | 1046 | 7718 |
| Oppenheim | city | Rheinland-Pfalz | Germany | 49.85 | 8.36 | 278 | 4402 |
| Oppenheimium | city | Rheinland-Pfalz | Germany | 49.85 | 8.36 | 278 | 4402 |
| Oppertshausen | city | Rheinland-Pfalz | Germany | 49.95 | 7.47 | 1059 | 7599 |
| Opsen | city | Rheinland-Pfalz | Germany | 50.78 | 7.66 | 830 | 11991 |