| Birkenhead to Oerlinghausen | 498.52 mi (802.29 km) |
| Birkenhead to Oestrich-Winkel | 525.97 mi (846.47 km) |
| Birkenhead to Offenburg | 584.75 mi (941.06 km) |
| Birkenhead to Oftersheim | 571.23 mi (919.31 km) |
| Birkenhead to Ohrdruf | 608.53 mi (979.34 km) |
| Birkenhead to Ohringen | 612.19 mi (985.23 km) |
| Birkenhead to Olbernhau | 718.20 mi (1,155.84 km) |
| Birkenhead to Olching | 719.53 mi (1,157.98 km) |
| Birkenhead to Oldenburg | 463.80 mi (746.42 km) |
| Birkenhead to Oldenburg in Holstein | 568.99 mi (915.70 km) |
| Birkenhead to Olfen | 451.42 mi (726.48 km) |
| Birkenhead to Olpe | 487.18 mi (784.05 km) |
| Birkenhead to Olsberg | 504.49 mi (811.90 km) |
| Birkenhead to Oranienburg | 674.56 mi (1,085.59 km) |
| Birkenhead to Ortenberg | 555.10 mi (893.34 km) |
