| Galveston to Nuth | 5,109.64 mi (8,223.17 km) |
| Galveston to Oegstgeest | 5,016.37 mi (8,073.07 km) |
| Galveston to Oirschot | 5,069.01 mi (8,157.79 km) |
| Galveston to Oisterwijk | 5,062.61 mi (8,147.49 km) |
| Galveston to Oldebroek | 5,062.69 mi (8,147.61 km) |
| Galveston to Oldenzaal | 5,105.72 mi (8,216.86 km) |
| Galveston to Ommen | 5,080.05 mi (8,175.54 km) |
| Galveston to Oosterend | 5,051.86 mi (8,130.19 km) |
| Galveston to Oosterhout | 5,047.58 mi (8,123.29 km) |
| Galveston to Oosterwolde | 5,060.64 mi (8,144.32 km) |
| Galveston to Oostzaan | 5,024.75 mi (8,086.56 km) |
| Galveston to Opmeer | 5,019.27 mi (8,077.73 km) |
| Galveston to Oss | 5,069.16 mi (8,158.02 km) |
| Galveston to Oud-Beijerland | 5,024.75 mi (8,086.56 km) |
| Galveston to Oudenbosch | 5,036.35 mi (8,105.22 km) |
