| Wallingford to Oerlinghausen | 418.99 mi (674.30 km) |
| Wallingford to Oestrich-Winkel | 413.20 mi (664.99 km) |
| Wallingford to Offenburg | 456.13 mi (734.07 km) |
| Wallingford to Oftersheim | 453.36 mi (729.62 km) |
| Wallingford to Ohrdruf | 515.40 mi (829.46 km) |
| Wallingford to Ohringen | 495.89 mi (798.06 km) |
| Wallingford to Olbernhau | 629.13 mi (1,012.48 km) |
| Wallingford to Olching | 600.49 mi (966.39 km) |
| Wallingford to Oldenburg | 407.83 mi (656.33 km) |
| Wallingford to Oldenburg in Holstein | 532.79 mi (857.44 km) |
| Wallingford to Olfen | 364.57 mi (586.72 km) |
| Wallingford to Olpe | 388.77 mi (625.67 km) |
| Wallingford to Olsberg | 413.56 mi (665.56 km) |
| Wallingford to Oranienburg | 612.68 mi (986.01 km) |
| Wallingford to Ortenberg | 450.73 mi (725.39 km) |
