| Reading to Oerlinghausen | 413.92 mi (666.13 km) |
| Reading to Oestrich-Winkel | 404.83 mi (651.50 km) |
| Reading to Offenburg | 446.05 mi (717.84 km) |
| Reading to Oftersheim | 444.38 mi (715.16 km) |
| Reading to Ohrdruf | 508.74 mi (818.73 km) |
| Reading to Ohringen | 487.00 mi (783.75 km) |
| Reading to Olbernhau | 622.63 mi (1,002.03 km) |
| Reading to Olching | 591.21 mi (951.45 km) |
| Reading to Oldenburg | 405.03 mi (651.83 km) |
| Reading to Oldenburg in Holstein | 531.26 mi (854.97 km) |
| Reading to Olfen | 359.01 mi (577.77 km) |
| Reading to Olpe | 381.94 mi (614.67 km) |
| Reading to Olsberg | 407.39 mi (655.63 km) |
| Reading to Oranienburg | 608.68 mi (979.58 km) |
| Reading to Ortenberg | 443.12 mi (713.13 km) |
