| Johnston to Ickenham | 4,171.06 mi (6,712.68 km) |
| Johnston to Ifield | 4,195.49 mi (6,751.99 km) |
| Johnston to Ilford | 4,190.73 mi (6,744.33 km) |
| Johnston to Ilfracombe | 4,045.92 mi (6,511.28 km) |
| Johnston to Ilkeston | 4,090.36 mi (6,582.79 km) |
| Johnston to Ilkley | 4,039.69 mi (6,501.26 km) |
| Johnston to Immingham | 4,107.28 mi (6,610.03 km) |
| Johnston to Ince-in-Makerfield | 4,024.63 mi (6,477.02 km) |
| Johnston to Inverness | 3,844.67 mi (6,187.40 km) |
| Johnston to Inverurie | 3,912.43 mi (6,296.45 km) |
| Johnston to Ipswich | 4,211.61 mi (6,777.93 km) |
| Johnston to Irlam | 4,034.17 mi (6,492.37 km) |
| Johnston to Irthlingborough | 4,137.97 mi (6,659.43 km) |
| Johnston to Irvine | 3,885.27 mi (6,252.74 km) |
| Johnston to Islington | 4,184.29 mi (6,733.96 km) |
