| Reston to Oberkirch | 4,090.05 mi (6,582.31 km) |
| Reston to Obernburg am Main | 4,094.38 mi (6,589.27 km) |
| Reston to Obernkirchen | 4,023.25 mi (6,474.79 km) |
| Reston to Oberschleissheim | 4,241.73 mi (6,826.40 km) |
| Reston to Oberstdorf | 4,215.56 mi (6,784.29 km) |
| Reston to Obertraubling | 4,243.05 mi (6,828.53 km) |
| Reston to Obertshausen | 4,075.31 mi (6,558.57 km) |
| Reston to Oberursel | 4,061.03 mi (6,535.59 km) |
| Reston to Ochsenfurt | 4,137.29 mi (6,658.33 km) |
| Reston to Ochsenhausen | 4,181.02 mi (6,728.71 km) |
| Reston to Ochtrup | 3,950.12 mi (6,357.10 km) |
| Reston to Odenthal | 3,979.13 mi (6,403.79 km) |
| Reston to Oelde | 3,997.77 mi (6,433.78 km) |
| Reston to Oelsnitz | 4,197.04 mi (6,754.49 km) |
| Reston to Oer-Erkenschwick | 3,967.74 mi (6,385.46 km) |
