| Berkhampstead to Octeville | 154.81 mi (249.15 km) |
| Berkhampstead to Oignies | 178.05 mi (286.54 km) |
| Berkhampstead to Oissel | 182.11 mi (293.08 km) |
| Berkhampstead to Olivet | 290.65 mi (467.75 km) |
| Berkhampstead to Ollioules | 666.00 mi (1,071.83 km) |
| Berkhampstead to Olonne-sur-Mer | 365.06 mi (587.51 km) |
| Berkhampstead to Oloron-Sainte-Marie | 591.84 mi (952.48 km) |
| Berkhampstead to Onet Village | 531.12 mi (854.75 km) |
| Berkhampstead to Onnaing | 203.85 mi (328.07 km) |
| Berkhampstead to Orange | 581.91 mi (936.49 km) |
| Berkhampstead to Orchies | 187.34 mi (301.50 km) |
| Berkhampstead to Orleans | 288.31 mi (463.98 km) |
| Berkhampstead to Orly | 245.81 mi (395.59 km) |
| Berkhampstead to Ormesson-sur-Marne | 246.83 mi (397.23 km) |
| Berkhampstead to Orsay | 243.89 mi (392.51 km) |
