| Falls Church to Oberkirch | 4,085.86 mi (6,575.56 km) |
| Falls Church to Obernburg am Main | 4,090.47 mi (6,582.97 km) |
| Falls Church to Obernkirchen | 4,019.76 mi (6,469.19 km) |
| Falls Church to Oberschleissheim | 4,237.68 mi (6,819.88 km) |
| Falls Church to Oberstdorf | 4,211.30 mi (6,777.43 km) |
| Falls Church to Obertraubling | 4,239.15 mi (6,822.26 km) |
| Falls Church to Obertshausen | 4,071.42 mi (6,552.31 km) |
| Falls Church to Oberursel | 4,057.15 mi (6,529.35 km) |
| Falls Church to Ochsenfurt | 4,133.40 mi (6,652.06 km) |
| Falls Church to Ochsenhausen | 4,176.86 mi (6,722.00 km) |
| Falls Church to Ochtrup | 3,946.53 mi (6,351.32 km) |
| Falls Church to Odenthal | 3,975.32 mi (6,397.67 km) |
| Falls Church to Oelde | 3,994.16 mi (6,427.98 km) |
| Falls Church to Oelsnitz | 4,193.39 mi (6,748.61 km) |
| Falls Church to Oer-Erkenschwick | 3,964.05 mi (6,379.53 km) |
