| Serpa to Oberkirch | 1,072.38 mi (1,725.83 km) |
| Serpa to Obernburg am Main | 1,165.52 mi (1,875.72 km) |
| Serpa to Obernkirchen | 1,275.70 mi (2,053.04 km) |
| Serpa to Oberschleissheim | 1,195.28 mi (1,923.62 km) |
| Serpa to Oberstdorf | 1,114.74 mi (1,794.00 km) |
| Serpa to Obertraubling | 1,243.71 mi (2,001.56 km) |
| Serpa to Obertshausen | 1,164.77 mi (1,874.51 km) |
| Serpa to Oberursel | 1,162.18 mi (1,870.34 km) |
| Serpa to Ochsenfurt | 1,190.43 mi (1,915.82 km) |
| Serpa to Ochsenhausen | 1,124.88 mi (1,810.32 km) |
| Serpa to Ochtrup | 1,216.26 mi (1,957.39 km) |
| Serpa to Odenthal | 1,154.80 mi (1,858.48 km) |
| Serpa to Oelde | 1,225.44 mi (1,972.15 km) |
| Serpa to Oelsnitz | 1,297.14 mi (2,087.55 km) |
| Serpa to Oer-Erkenschwick | 1,189.26 mi (1,913.92 km) |
