| River Forest to Ickenham | 3,940.16 mi (6,341.08 km) |
| River Forest to Ifield | 3,963.36 mi (6,378.42 km) |
| River Forest to Ilford | 3,960.49 mi (6,373.79 km) |
| River Forest to Ilfracombe | 3,809.42 mi (6,130.66 km) |
| River Forest to Ilkeston | 3,863.53 mi (6,217.75 km) |
| River Forest to Ilkley | 3,815.86 mi (6,141.04 km) |
| River Forest to Immingham | 3,884.16 mi (6,250.95 km) |
| River Forest to Ince-in-Makerfield | 3,798.44 mi (6,113.00 km) |
| River Forest to Inverness | 3,632.71 mi (5,846.28 km) |
| River Forest to Inverurie | 3,701.52 mi (5,957.03 km) |
| River Forest to Ipswich | 3,984.49 mi (6,412.41 km) |
| River Forest to Irlam | 3,807.82 mi (6,128.10 km) |
| River Forest to Irthlingborough | 3,909.61 mi (6,291.91 km) |
| River Forest to Irvine | 3,665.04 mi (5,898.31 km) |
| River Forest to Islington | 3,953.76 mi (6,362.97 km) |
