| Falls Church to Octeville | 3,649.98 mi (5,874.08 km) |
| Falls Church to Oignies | 3,823.29 mi (6,152.99 km) |
| Falls Church to Oissel | 3,772.11 mi (6,070.63 km) |
| Falls Church to Olivet | 3,843.91 mi (6,186.17 km) |
| Falls Church to Ollioules | 4,153.60 mi (6,684.57 km) |
| Falls Church to Olonne-sur-Mer | 3,717.33 mi (5,982.46 km) |
| Falls Church to Oloron-Sainte-Marie | 3,858.19 mi (6,209.16 km) |
| Falls Church to Onet Village | 3,970.56 mi (6,389.99 km) |
| Falls Church to Onnaing | 3,850.12 mi (6,196.17 km) |
| Falls Church to Orange | 4,076.41 mi (6,560.35 km) |
| Falls Church to Orchies | 3,833.43 mi (6,169.30 km) |
| Falls Church to Orleans | 3,843.26 mi (6,185.13 km) |
| Falls Church to Orly | 3,842.05 mi (6,183.18 km) |
| Falls Church to Ormesson-sur-Marne | 3,847.11 mi (6,191.33 km) |
| Falls Church to Orsay | 3,834.54 mi (6,171.10 km) |
