| Porsgrunn to Illzach | 788.94 mi (1,269.68 km) |
| Porsgrunn to Ingre | 837.24 mi (1,347.41 km) |
| Porsgrunn to Irigny | 950.74 mi (1,530.07 km) |
| Porsgrunn to Isbergues | 652.92 mi (1,050.77 km) |
| Porsgrunn to Issoire | 975.47 mi (1,569.86 km) |
| Porsgrunn to Issoudun | 898.35 mi (1,445.75 km) |
| Porsgrunn to Issy-les-Moulineaux | 771.59 mi (1,241.75 km) |
| Porsgrunn to Istres | 1,096.32 mi (1,764.36 km) |
| Porsgrunn to Ivry-sur-Seine | 771.01 mi (1,240.82 km) |
| Porsgrunn to Jarville-la-Malgrange | 735.47 mi (1,183.62 km) |
| Porsgrunn to Jeumont | 648.76 mi (1,044.07 km) |
| Porsgrunn to Joigny | 810.85 mi (1,304.93 km) |
| Porsgrunn to Joinville-le-Pont | 768.62 mi (1,236.98 km) |
| Porsgrunn to Joue-les-Tours | 892.95 mi (1,437.07 km) |
| Porsgrunn to Jouy-le-Moutier | 763.17 mi (1,228.21 km) |
