| Potters Bar to Octeville | 156.73 mi (252.23 km) |
| Potters Bar to Oignies | 161.90 mi (260.55 km) |
| Potters Bar to Oissel | 172.14 mi (277.03 km) |
| Potters Bar to Olivet | 280.72 mi (451.77 km) |
| Potters Bar to Ollioules | 654.55 mi (1,053.40 km) |
| Potters Bar to Olonne-sur-Mer | 363.80 mi (585.48 km) |
| Potters Bar to Oloron-Sainte-Marie | 587.89 mi (946.11 km) |
| Potters Bar to Onet Village | 522.51 mi (840.89 km) |
| Potters Bar to Onnaing | 187.52 mi (301.78 km) |
| Potters Bar to Orange | 570.87 mi (918.72 km) |
| Potters Bar to Orchies | 171.06 mi (275.29 km) |
| Potters Bar to Orleans | 278.31 mi (447.90 km) |
| Potters Bar to Orly | 233.69 mi (376.08 km) |
| Potters Bar to Ormesson-sur-Marne | 234.37 mi (377.18 km) |
| Potters Bar to Orsay | 232.25 mi (373.77 km) |
