| Keystone to Oberkirch | 4,818.30 mi (7,754.30 km) |
| Keystone to Obernburg am Main | 4,832.17 mi (7,776.63 km) |
| Keystone to Obernkirchen | 4,774.47 mi (7,683.77 km) |
| Keystone to Oberschleissheim | 4,974.39 mi (8,005.51 km) |
| Keystone to Oberstdorf | 4,940.85 mi (7,951.54 km) |
| Keystone to Obertraubling | 4,980.85 mi (8,015.90 km) |
| Keystone to Obertshausen | 4,813.93 mi (7,747.28 km) |
| Keystone to Oberursel | 4,800.05 mi (7,724.94 km) |
| Keystone to Ochsenfurt | 4,875.47 mi (7,846.30 km) |
| Keystone to Ochsenhausen | 4,909.73 mi (7,901.44 km) |
| Keystone to Ochtrup | 4,698.55 mi (7,561.58 km) |
| Keystone to Odenthal | 4,720.83 mi (7,597.45 km) |
| Keystone to Oelde | 4,745.39 mi (7,636.96 km) |
| Keystone to Oelsnitz | 4,942.76 mi (7,954.61 km) |
| Keystone to Oer-Erkenschwick | 4,713.10 mi (7,585.01 km) |
