| Middlesex to Ickenham | 3,473.20 mi (5,589.58 km) |
| Middlesex to Ifield | 3,492.60 mi (5,620.80 km) |
| Middlesex to Ilford | 3,494.98 mi (5,624.63 km) |
| Middlesex to Ilfracombe | 3,329.18 mi (5,357.80 km) |
| Middlesex to Ilkeston | 3,409.25 mi (5,486.67 km) |
| Middlesex to Ilkley | 3,370.79 mi (5,424.76 km) |
| Middlesex to Immingham | 3,439.67 mi (5,535.61 km) |
| Middlesex to Ince-in-Makerfield | 3,347.20 mi (5,386.79 km) |
| Middlesex to Inverness | 3,224.31 mi (5,189.02 km) |
| Middlesex to Inverurie | 3,294.36 mi (5,301.76 km) |
| Middlesex to Ipswich | 3,527.13 mi (5,676.37 km) |
| Middlesex to Irlam | 3,355.95 mi (5,400.88 km) |
| Middlesex to Irthlingborough | 3,450.22 mi (5,552.59 km) |
| Middlesex to Irvine | 3,233.10 mi (5,203.17 km) |
| Middlesex to Islington | 3,487.60 mi (5,612.75 km) |
