| Berkhampstead to Oerlinghausen | 393.68 mi (633.56 km) |
| Berkhampstead to Oestrich-Winkel | 392.20 mi (631.19 km) |
| Berkhampstead to Offenburg | 439.35 mi (707.07 km) |
| Berkhampstead to Oftersheim | 433.59 mi (697.79 km) |
| Berkhampstead to Ohrdruf | 491.64 mi (791.21 km) |
| Berkhampstead to Ohringen | 475.87 mi (765.84 km) |
| Berkhampstead to Olbernhau | 605.11 mi (973.83 km) |
| Berkhampstead to Olching | 581.30 mi (935.50 km) |
| Berkhampstead to Oldenburg | 381.35 mi (613.72 km) |
| Berkhampstead to Oldenburg in Holstein | 506.15 mi (814.56 km) |
| Berkhampstead to Olfen | 339.71 mi (546.71 km) |
| Berkhampstead to Olpe | 365.31 mi (587.91 km) |
| Berkhampstead to Olsberg | 389.28 mi (626.48 km) |
| Berkhampstead to Oranienburg | 586.63 mi (944.08 km) |
| Berkhampstead to Ortenberg | 428.35 mi (689.36 km) |
