| Horn Lake to Oberkirch | 4,792.32 mi (7,712.49 km) |
| Horn Lake to Obernburg am Main | 4,788.55 mi (7,706.43 km) |
| Horn Lake to Obernkirchen | 4,704.57 mi (7,571.27 km) |
| Horn Lake to Oberschleissheim | 4,939.36 mi (7,949.13 km) |
| Horn Lake to Oberstdorf | 4,919.30 mi (7,916.84 km) |
| Horn Lake to Obertraubling | 4,936.17 mi (7,944.00 km) |
| Horn Lake to Obertshausen | 4,768.86 mi (7,674.74 km) |
| Horn Lake to Oberursel | 4,754.32 mi (7,651.33 km) |
| Horn Lake to Ochsenfurt | 4,830.82 mi (7,774.45 km) |
| Horn Lake to Ochsenhausen | 4,882.32 mi (7,857.34 km) |
| Horn Lake to Ochtrup | 4,635.01 mi (7,459.33 km) |
| Horn Lake to Odenthal | 4,670.52 mi (7,516.48 km) |
| Horn Lake to Oelde | 4,683.14 mi (7,536.79 km) |
| Horn Lake to Oelsnitz | 4,882.87 mi (7,858.22 km) |
| Horn Lake to Oer-Erkenschwick | 4,655.65 mi (7,492.54 km) |
