| Heath to Ickenham | 3,817.26 mi (6,143.29 km) |
| Heath to Ifield | 3,838.51 mi (6,177.49 km) |
| Heath to Ilford | 3,838.43 mi (6,177.35 km) |
| Heath to Ilfracombe | 3,679.00 mi (5,920.77 km) |
| Heath to Ilkeston | 3,747.07 mi (6,030.33 km) |
| Heath to Ilkley | 3,704.04 mi (5,961.08 km) |
| Heath to Immingham | 3,772.89 mi (6,071.88 km) |
| Heath to Ince-in-Makerfield | 3,683.33 mi (5,927.75 km) |
| Heath to Inverness | 3,538.95 mi (5,695.39 km) |
| Heath to Inverurie | 3,608.69 mi (5,807.62 km) |
| Heath to Ipswich | 3,866.82 mi (6,223.05 km) |
| Heath to Irlam | 3,692.42 mi (5,942.38 km) |
| Heath to Irthlingborough | 3,790.62 mi (6,100.41 km) |
| Heath to Irvine | 3,559.42 mi (5,728.33 km) |
| Heath to Islington | 3,831.33 mi (6,165.93 km) |
