| West Allis to Orbetello | 4,702.63 mi (7,568.15 km) |
| West Allis to Oria | 5,041.81 mi (8,114.01 km) |
| West Allis to Oristano | 4,705.65 mi (7,573.01 km) |
| West Allis to Orta Nova | 4,928.84 mi (7,932.20 km) |
| West Allis to Orte | 4,748.09 mi (7,641.31 km) |
| West Allis to Ortona | 4,831.70 mi (7,775.87 km) |
| West Allis to Orvieto | 4,725.93 mi (7,605.65 km) |
| West Allis to Orzinuovi | 4,526.32 mi (7,284.40 km) |
| West Allis to Osimo | 4,745.77 mi (7,637.58 km) |
| West Allis to Ospitaletto | 4,525.22 mi (7,282.63 km) |
| West Allis to Ostuni | 5,028.98 mi (8,093.37 km) |
| West Allis to Ottaviano | 4,902.36 mi (7,889.59 km) |
| West Allis to Ovada | 4,507.86 mi (7,254.70 km) |
| West Allis to Ozieri | 4,693.47 mi (7,553.40 km) |
| West Allis to Paceco | 4,954.16 mi (7,972.95 km) |
