| Galveston to Oerlinghausen | 5,181.98 mi (8,339.60 km) |
| Galveston to Oestrich-Winkel | 5,221.52 mi (8,403.23 km) |
| Galveston to Offenburg | 5,269.79 mi (8,480.91 km) |
| Galveston to Oftersheim | 5,265.39 mi (8,473.83 km) |
| Galveston to Ohrdruf | 5,298.21 mi (8,526.64 km) |
| Galveston to Ohringen | 5,307.11 mi (8,540.97 km) |
| Galveston to Olbernhau | 5,401.21 mi (8,692.41 km) |
| Galveston to Olching | 5,413.55 mi (8,712.27 km) |
| Galveston to Oldenburg | 5,126.70 mi (8,250.62 km) |
| Galveston to Oldenburg in Holstein | 5,183.84 mi (8,342.59 km) |
| Galveston to Olfen | 5,141.83 mi (8,274.98 km) |
| Galveston to Olpe | 5,181.67 mi (8,339.09 km) |
| Galveston to Olsberg | 5,195.47 mi (8,361.31 km) |
| Galveston to Oranienburg | 5,321.45 mi (8,564.04 km) |
| Galveston to Ortenberg | 5,250.52 mi (8,449.90 km) |
