| Horten to Oberkirch | 758.17 mi (1,220.15 km) |
| Horten to Obernburg am Main | 663.95 mi (1,068.52 km) |
| Horten to Obernkirchen | 496.92 mi (799.72 km) |
| Horten to Oberschleissheim | 773.18 mi (1,244.32 km) |
| Horten to Oberstdorf | 829.91 mi (1,335.61 km) |
| Horten to Obertraubling | 725.70 mi (1,167.90 km) |
| Horten to Obertshausen | 649.40 mi (1,045.10 km) |
| Horten to Oberursel | 641.08 mi (1,031.71 km) |
| Horten to Ochsenfurt | 675.25 mi (1,086.72 km) |
| Horten to Ochsenhausen | 784.36 mi (1,262.30 km) |
| Horten to Ochtrup | 514.01 mi (827.23 km) |
| Horten to Odenthal | 593.88 mi (955.76 km) |
| Horten to Oelde | 531.67 mi (855.65 km) |
| Horten to Oelsnitz | 625.87 mi (1,007.23 km) |
| Horten to Oer-Erkenschwick | 551.50 mi (887.56 km) |
