| Castle Rock to Ickenham | 4,686.69 mi (7,542.49 km) |
| Castle Rock to Ifield | 4,712.82 mi (7,584.55 km) |
| Castle Rock to Ilford | 4,705.22 mi (7,572.32 km) |
| Castle Rock to Ilfracombe | 4,570.78 mi (7,355.96 km) |
| Castle Rock to Ilkeston | 4,600.33 mi (7,403.51 km) |
| Castle Rock to Ilkley | 4,545.46 mi (7,315.22 km) |
| Castle Rock to Immingham | 4,611.46 mi (7,421.43 km) |
| Castle Rock to Ince-in-Makerfield | 4,534.11 mi (7,296.94 km) |
| Castle Rock to Inverness | 4,333.83 mi (6,974.63 km) |
| Castle Rock to Inverurie | 4,399.36 mi (7,080.09 km) |
| Castle Rock to Ipswich | 4,721.18 mi (7,598.01 km) |
| Castle Rock to Irlam | 4,543.82 mi (7,312.57 km) |
| Castle Rock to Irthlingborough | 4,649.96 mi (7,483.38 km) |
| Castle Rock to Irvine | 4,386.75 mi (7,059.80 km) |
| Castle Rock to Islington | 4,699.25 mi (7,562.71 km) |
