| Barnstaple to Oerlinghausen | 549.82 mi (884.85 km) |
| Barnstaple to Oestrich-Winkel | 534.18 mi (859.69 km) |
| Barnstaple to Offenburg | 564.03 mi (907.72 km) |
| Barnstaple to Oftersheim | 570.52 mi (918.17 km) |
| Barnstaple to Ohrdruf | 643.01 mi (1,034.82 km) |
| Barnstaple to Ohringen | 613.42 mi (987.20 km) |
| Barnstaple to Olbernhau | 757.13 mi (1,218.48 km) |
| Barnstaple to Olching | 714.70 mi (1,150.20 km) |
| Barnstaple to Oldenburg | 539.21 mi (867.78 km) |
| Barnstaple to Oldenburg in Holstein | 662.65 mi (1,066.43 km) |
| Barnstaple to Olfen | 494.74 mi (796.20 km) |
| Barnstaple to Olpe | 516.06 mi (830.52 km) |
| Barnstaple to Olsberg | 542.53 mi (873.12 km) |
| Barnstaple to Oranienburg | 744.29 mi (1,197.82 km) |
| Barnstaple to Ortenberg | 575.15 mi (925.61 km) |
