| Drexel Hill to Oerlinghausen | 3,887.43 mi (6,256.21 km) |
| Drexel Hill to Oestrich-Winkel | 3,916.06 mi (6,302.29 km) |
| Drexel Hill to Offenburg | 3,957.71 mi (6,369.32 km) |
| Drexel Hill to Oftersheim | 3,957.97 mi (6,369.74 km) |
| Drexel Hill to Ohrdruf | 4,001.10 mi (6,439.15 km) |
| Drexel Hill to Ohringen | 4,000.30 mi (6,437.86 km) |
| Drexel Hill to Olbernhau | 4,107.95 mi (6,611.11 km) |
| Drexel Hill to Olching | 4,105.25 mi (6,606.76 km) |
| Drexel Hill to Oldenburg | 3,838.10 mi (6,176.82 km) |
| Drexel Hill to Oldenburg in Holstein | 3,907.28 mi (6,288.17 km) |
| Drexel Hill to Olfen | 3,843.89 mi (6,186.15 km) |
| Drexel Hill to Olpe | 3,880.83 mi (6,245.59 km) |
| Drexel Hill to Olsberg | 3,897.34 mi (6,272.16 km) |
| Drexel Hill to Oranienburg | 4,039.78 mi (6,501.39 km) |
| Drexel Hill to Ortenberg | 3,948.33 mi (6,354.22 km) |
