| West Mifflin to Oerlinghausen | 4,045.49 mi (6,510.58 km) |
| West Mifflin to Oestrich-Winkel | 4,081.54 mi (6,568.60 km) |
| West Mifflin to Offenburg | 4,128.28 mi (6,643.82 km) |
| West Mifflin to Oftersheim | 4,124.92 mi (6,638.41 km) |
| West Mifflin to Ohrdruf | 4,160.90 mi (6,696.32 km) |
| West Mifflin to Ohringen | 4,166.81 mi (6,705.83 km) |
| West Mifflin to Olbernhau | 4,265.39 mi (6,864.48 km) |
| West Mifflin to Olching | 4,272.92 mi (6,876.60 km) |
| West Mifflin to Oldenburg | 3,992.41 mi (6,425.17 km) |
| West Mifflin to Oldenburg in Holstein | 4,054.76 mi (6,525.50 km) |
| West Mifflin to Olfen | 4,004.11 mi (6,444.00 km) |
| West Mifflin to Olpe | 4,043.03 mi (6,506.62 km) |
| West Mifflin to Olsberg | 4,057.73 mi (6,530.29 km) |
| West Mifflin to Oranienburg | 4,190.27 mi (6,743.59 km) |
| West Mifflin to Ortenberg | 4,111.51 mi (6,616.83 km) |
