| Portsmouth to Orthez | 505.82 mi (814.04 km) |
| Portsmouth to Orvault | 245.38 mi (394.90 km) |
| Portsmouth to Osny | 184.87 mi (297.51 km) |
| Portsmouth to Ostwald | 422.86 mi (680.52 km) |
| Portsmouth to Ouistreham | 111.70 mi (179.77 km) |
| Portsmouth to Oullins | 443.84 mi (714.29 km) |
| Portsmouth to Outreau | 117.40 mi (188.94 km) |
| Portsmouth to Oyonnax | 440.11 mi (708.29 km) |
| Portsmouth to Ozoir-la-Ferriere | 218.73 mi (352.02 km) |
| Portsmouth to Pace | 186.22 mi (299.69 km) |
| Portsmouth to Palaiseau | 207.34 mi (333.69 km) |
| Portsmouth to Pamiers | 546.21 mi (879.03 km) |
| Portsmouth to Panazol | 360.37 mi (579.95 km) |
| Portsmouth to Pantin | 203.82 mi (328.02 km) |
| Portsmouth to Paray-le-Monial | 383.29 mi (616.84 km) |
