| Galveston to Octeville | 4,844.15 mi (7,795.91 km) |
| Galveston to Oignies | 5,009.45 mi (8,061.93 km) |
| Galveston to Oissel | 4,964.78 mi (7,990.04 km) |
| Galveston to Olivet | 5,040.82 mi (8,112.42 km) |
| Galveston to Ollioules | 5,358.68 mi (8,623.96 km) |
| Galveston to Olonne-sur-Mer | 4,920.65 mi (7,919.03 km) |
| Galveston to Oloron-Sainte-Marie | 5,066.41 mi (8,153.59 km) |
| Galveston to Onet Village | 5,175.55 mi (8,329.25 km) |
| Galveston to Onnaing | 5,035.91 mi (8,104.52 km) |
| Galveston to Orange | 5,280.36 mi (8,497.91 km) |
| Galveston to Orchies | 5,019.26 mi (8,077.73 km) |
| Galveston to Orleans | 5,040.05 mi (8,111.17 km) |
| Galveston to Orly | 5,035.56 mi (8,103.96 km) |
| Galveston to Ormesson-sur-Marne | 5,040.33 mi (8,111.63 km) |
| Galveston to Orsay | 5,028.42 mi (8,092.47 km) |
