| Williamsport to Oerlinghausen | 3,894.26 mi (6,267.21 km) |
| Williamsport to Oestrich-Winkel | 3,928.10 mi (6,321.66 km) |
| Williamsport to Offenburg | 3,973.43 mi (6,394.61 km) |
| Williamsport to Oftersheim | 3,971.07 mi (6,390.82 km) |
| Williamsport to Ohrdruf | 4,009.18 mi (6,452.14 km) |
| Williamsport to Ohringen | 4,013.10 mi (6,458.46 km) |
| Williamsport to Olbernhau | 4,114.43 mi (6,621.54 km) |
| Williamsport to Olching | 4,118.91 mi (6,628.75 km) |
| Williamsport to Oldenburg | 3,842.35 mi (6,183.67 km) |
| Williamsport to Oldenburg in Holstein | 3,906.98 mi (6,287.68 km) |
| Williamsport to Olfen | 3,852.21 mi (6,199.53 km) |
| Williamsport to Olpe | 3,890.54 mi (6,261.21 km) |
| Williamsport to Olsberg | 3,905.79 mi (6,285.76 km) |
| Williamsport to Oranienburg | 4,041.53 mi (6,504.22 km) |
| Williamsport to Ortenberg | 3,958.75 mi (6,370.99 km) |
