| Key West to Oberkirch | 4,958.24 mi (7,979.51 km) |
| Key West to Obernburg am Main | 4,977.70 mi (8,010.84 km) |
| Key West to Obernkirchen | 4,928.60 mi (7,931.81 km) |
| Key West to Oberschleissheim | 5,116.28 mi (8,233.86 km) |
| Key West to Oberstdorf | 5,078.57 mi (8,173.17 km) |
| Key West to Obertraubling | 5,125.79 mi (8,249.17 km) |
| Key West to Obertshausen | 4,960.04 mi (7,982.41 km) |
| Key West to Oberursel | 4,946.45 mi (7,960.55 km) |
| Key West to Ochsenfurt | 5,021.05 mi (8,080.60 km) |
| Key West to Ochsenhausen | 5,049.55 mi (8,126.47 km) |
| Key West to Ochtrup | 4,851.17 mi (7,807.20 km) |
| Key West to Odenthal | 4,869.18 mi (7,836.18 km) |
| Key West to Oelde | 4,897.32 mi (7,881.47 km) |
| Key West to Oelsnitz | 5,092.76 mi (8,196.00 km) |
| Key West to Oer-Erkenschwick | 4,863.74 mi (7,827.44 km) |
