| Porsgrunn to Orthez | 1,167.59 mi (1,879.05 km) |
| Porsgrunn to Orvault | 940.36 mi (1,513.36 km) |
| Porsgrunn to Osny | 759.66 mi (1,222.56 km) |
| Porsgrunn to Ostwald | 734.38 mi (1,181.86 km) |
| Porsgrunn to Ouistreham | 788.20 mi (1,268.49 km) |
| Porsgrunn to Oullins | 948.02 mi (1,525.69 km) |
| Porsgrunn to Outreau | 663.53 mi (1,067.84 km) |
| Porsgrunn to Oyonnax | 904.17 mi (1,455.12 km) |
| Porsgrunn to Ozoir-la-Ferriere | 768.34 mi (1,236.52 km) |
| Porsgrunn to Pace | 889.23 mi (1,431.08 km) |
| Porsgrunn to Palaiseau | 779.07 mi (1,253.79 km) |
| Porsgrunn to Pamiers | 1,157.91 mi (1,863.47 km) |
| Porsgrunn to Panazol | 981.28 mi (1,579.21 km) |
| Porsgrunn to Pantin | 764.82 mi (1,230.86 km) |
| Porsgrunn to Paray-le-Monial | 904.91 mi (1,456.30 km) |
