| Galveston to Opwijk | 5,041.76 mi (8,113.92 km) |
| Galveston to Ostend | 4,984.52 mi (8,021.80 km) |
| Galveston to Oud-Heverlee | 5,064.73 mi (8,150.90 km) |
| Galveston to Oud-Turnhout | 5,062.37 mi (8,147.10 km) |
| Galveston to Oudenaarde | 5,022.29 mi (8,082.60 km) |
| Galveston to Oudenburg | 4,988.91 mi (8,028.88 km) |
| Galveston to Oupeye | 5,106.78 mi (8,218.57 km) |
| Galveston to Overijse | 5,061.01 mi (8,144.92 km) |
| Galveston to Overpelt | 5,082.23 mi (8,179.06 km) |
| Galveston to Paal | 5,078.22 mi (8,172.60 km) |
| Galveston to Peer | 5,086.25 mi (8,185.53 km) |
| Galveston to Pepinster | 5,117.99 mi (8,236.61 km) |
| Galveston to Peruwelz | 5,031.50 mi (8,097.42 km) |
| Galveston to Perwez | 5,076.92 mi (8,170.52 km) |
| Galveston to Philippeville | 5,079.39 mi (8,174.48 km) |
