| Oro Valley to Oberkirch | 5,701.34 mi (9,175.42 km) |
| Oro Valley to Obernburg am Main | 5,676.07 mi (9,134.76 km) |
| Oro Valley to Obernkirchen | 5,562.32 mi (8,951.69 km) |
| Oro Valley to Oberschleissheim | 5,831.35 mi (9,384.65 km) |
| Oro Valley to Oberstdorf | 5,828.63 mi (9,380.27 km) |
| Oro Valley to Obertraubling | 5,816.20 mi (9,360.27 km) |
| Oro Valley to Obertshausen | 5,655.40 mi (9,101.48 km) |
| Oro Valley to Oberursel | 5,640.64 mi (9,077.74 km) |
| Oro Valley to Ochsenfurt | 5,715.29 mi (9,197.87 km) |
| Oro Valley to Ochsenhausen | 5,786.01 mi (9,311.68 km) |
| Oro Valley to Ochtrup | 5,504.06 mi (8,857.93 km) |
| Oro Valley to Odenthal | 5,554.70 mi (8,939.43 km) |
| Oro Valley to Oelde | 5,551.70 mi (8,934.60 km) |
| Oro Valley to Oelsnitz | 5,745.72 mi (9,246.84 km) |
| Oro Valley to Oer-Erkenschwick | 5,531.50 mi (8,902.08 km) |
