| Porsgrunn to Ifield | 675.60 mi (1,087.28 km) |
| Porsgrunn to Ilford | 643.44 mi (1,035.51 km) |
| Porsgrunn to Ilfracombe | 769.49 mi (1,238.37 km) |
| Porsgrunn to Ilkeston | 599.49 mi (964.78 km) |
| Porsgrunn to Ilkley | 565.97 mi (910.84 km) |
| Porsgrunn to Immingham | 536.43 mi (863.31 km) |
| Porsgrunn to Ince-in-Makerfield | 607.28 mi (977.32 km) |
| Porsgrunn to Inverness | 517.44 mi (832.74 km) |
| Porsgrunn to Inverurie | 457.39 mi (736.10 km) |
| Porsgrunn to Ipswich | 589.99 mi (949.49 km) |
| Porsgrunn to Irlam | 606.73 mi (976.43 km) |
| Porsgrunn to Irthlingborough | 616.37 mi (991.95 km) |
| Porsgrunn to Irvine | 585.86 mi (942.85 km) |
| Porsgrunn to Islington | 648.54 mi (1,043.73 km) |
| Porsgrunn to Iver | 659.31 mi (1,061.06 km) |
