| Portchester to Ickenham | 57.38 mi (92.35 km) |
| Portchester to Ifield | 44.21 mi (71.14 km) |
| Portchester to Ilford | 71.90 mi (115.70 km) |
| Portchester to Ilfracombe | 132.79 mi (213.71 km) |
| Portchester to Ilkeston | 147.32 mi (237.09 km) |
| Portchester to Ilkley | 215.06 mi (346.10 km) |
| Portchester to Immingham | 195.28 mi (314.27 km) |
| Portchester to Ince-in-Makerfield | 196.66 mi (316.49 km) |
| Portchester to Inverness | 475.25 mi (764.85 km) |
| Portchester to Inverurie | 447.73 mi (720.55 km) |
| Portchester to Ipswich | 129.12 mi (207.81 km) |
| Portchester to Irlam | 188.12 mi (302.76 km) |
| Portchester to Irthlingborough | 104.67 mi (168.46 km) |
| Portchester to Irvine | 361.05 mi (581.06 km) |
| Portchester to Islington | 65.52 mi (105.44 km) |
