| Ourense to Oberkirch | 881.33 mi (1,418.37 km) |
| Ourense to Obernburg am Main | 962.41 mi (1,548.84 km) |
| Ourense to Obernkirchen | 1,045.99 mi (1,683.37 km) |
| Ourense to Oberschleissheim | 1,025.33 mi (1,650.11 km) |
| Ourense to Oberstdorf | 952.19 mi (1,532.41 km) |
| Ourense to Obertraubling | 1,066.06 mi (1,715.66 km) |
| Ourense to Obertshausen | 957.25 mi (1,540.54 km) |
| Ourense to Oberursel | 951.65 mi (1,531.54 km) |
| Ourense to Ochsenfurt | 994.35 mi (1,600.26 km) |
| Ourense to Ochsenhausen | 950.43 mi (1,529.56 km) |
| Ourense to Ochtrup | 977.72 mi (1,573.49 km) |
| Ourense to Odenthal | 927.07 mi (1,491.98 km) |
| Ourense to Oelde | 995.15 mi (1,601.55 km) |
| Ourense to Oelsnitz | 1,100.89 mi (1,771.71 km) |
| Ourense to Oer-Erkenschwick | 956.19 mi (1,538.84 km) |
