| Holbrook to Ickenham | 3,405.20 mi (5,480.14 km) |
| Holbrook to Ifield | 3,424.31 mi (5,510.89 km) |
| Holbrook to Ilford | 3,427.06 mi (5,515.33 km) |
| Holbrook to Ilfracombe | 3,260.39 mi (5,247.08 km) |
| Holbrook to Ilkeston | 3,342.24 mi (5,378.82 km) |
| Holbrook to Ilkley | 3,304.51 mi (5,318.09 km) |
| Holbrook to Immingham | 3,373.35 mi (5,428.89 km) |
| Holbrook to Ince-in-Makerfield | 3,280.48 mi (5,279.42 km) |
| Holbrook to Inverness | 3,161.09 mi (5,087.28 km) |
| Holbrook to Inverurie | 3,231.14 mi (5,200.01 km) |
| Holbrook to Ipswich | 3,459.77 mi (5,567.96 km) |
| Holbrook to Irlam | 3,289.18 mi (5,293.43 km) |
| Holbrook to Irthlingborough | 3,382.79 mi (5,444.07 km) |
| Holbrook to Irvine | 3,168.00 mi (5,098.40 km) |
| Holbrook to Islington | 3,419.64 mi (5,503.38 km) |
