 |
| 82487 | Oberammergau |
| 46xxx | Oberhausen |
| 78727 | Oberndorf am Neckar |
| 87561 | Oberstdorf |
| 92526 | Oberviechtach |
| 97199 | Ochsenfurt |
| 74613 | Öhringen |
| 59302 | Oelde |
| 630xx | Offenbach |
| 7765x | Offenburg |
| 89362 | Offingen |
| 261xx | Oldenburg |
| 23758 | Oldenburg in Holstein |
| 57462 | Olpe |
| 16515 | Oranienburg |
| 490xx | Osnabrück |
| 27711 | Osterholz-Scharmbeck |
| 85521 | Ottobrunn |
