| West Allis to Oerlinghausen | 4,215.15 mi (6,783.62 km) |
| West Allis to Oestrich-Winkel | 4,267.35 mi (6,867.64 km) |
| West Allis to Offenburg | 4,325.16 mi (6,960.67 km) |
| West Allis to Oftersheim | 4,313.59 mi (6,942.05 km) |
| West Allis to Ohrdruf | 4,333.16 mi (6,973.54 km) |
| West Allis to Ohringen | 4,354.07 mi (7,007.21 km) |
| West Allis to Olbernhau | 4,431.29 mi (7,131.48 km) |
| West Allis to Olching | 4,461.74 mi (7,180.47 km) |
| West Allis to Oldenburg | 4,154.44 mi (6,685.92 km) |
| West Allis to Oldenburg in Holstein | 4,201.16 mi (6,761.12 km) |
| West Allis to Olfen | 4,179.03 mi (6,725.49 km) |
| West Allis to Olpe | 4,221.92 mi (6,794.52 km) |
| West Allis to Olsberg | 4,232.42 mi (6,811.43 km) |
| West Allis to Oranienburg | 4,341.71 mi (6,987.30 km) |
| West Allis to Ortenberg | 4,291.84 mi (6,907.05 km) |
