| Portsmouth to Octeville | 85.08 mi (136.92 km) |
| Portsmouth to Oignies | 180.31 mi (290.17 km) |
| Portsmouth to Oissel | 139.86 mi (225.08 km) |
| Portsmouth to Olivet | 243.70 mi (392.20 km) |
| Portsmouth to Ollioules | 621.83 mi (1,000.74 km) |
| Portsmouth to Olonne-sur-Mer | 296.66 mi (477.42 km) |
| Portsmouth to Oloron-Sainte-Marie | 526.39 mi (847.15 km) |
| Portsmouth to Onet Village | 476.74 mi (767.23 km) |
| Portsmouth to Onnaing | 207.47 mi (333.90 km) |
| Portsmouth to Orange | 536.33 mi (863.14 km) |
| Portsmouth to Orchies | 191.14 mi (307.61 km) |
| Portsmouth to Orleans | 241.66 mi (388.92 km) |
| Portsmouth to Orly | 210.69 mi (339.07 km) |
| Portsmouth to Ormesson-sur-Marne | 213.56 mi (343.69 km) |
| Portsmouth to Orsay | 206.31 mi (332.02 km) |
