| Gaeta to Oberkirch | 572.04 mi (920.60 km) |
| Gaeta to Obernburg am Main | 632.86 mi (1,018.48 km) |
| Gaeta to Obernkirchen | 791.60 mi (1,273.96 km) |
| Gaeta to Oberschleissheim | 495.72 mi (797.79 km) |
| Gaeta to Oberstdorf | 457.61 mi (736.45 km) |
| Gaeta to Obertraubling | 539.72 mi (868.60 km) |
| Gaeta to Obertshausen | 652.49 mi (1,050.08 km) |
| Gaeta to Oberursel | 665.57 mi (1,071.13 km) |
| Gaeta to Ochsenfurt | 606.71 mi (976.41 km) |
| Gaeta to Ochsenhausen | 505.82 mi (814.04 km) |
| Gaeta to Ochtrup | 816.37 mi (1,313.81 km) |
| Gaeta to Odenthal | 744.58 mi (1,198.28 km) |
| Gaeta to Oelde | 776.87 mi (1,250.26 km) |
| Gaeta to Oelsnitz | 639.19 mi (1,028.68 km) |
| Gaeta to Oer-Erkenschwick | 779.88 mi (1,255.10 km) |
