| Catonsville to Ickenham | 3,622.38 mi (5,829.66 km) |
| Catonsville to Ifield | 3,641.83 mi (5,860.95 km) |
| Catonsville to Ilford | 3,644.15 mi (5,864.69 km) |
| Catonsville to Ilfracombe | 3,478.47 mi (5,598.05 km) |
| Catonsville to Ilkeston | 3,558.22 mi (5,726.40 km) |
| Catonsville to Ilkley | 3,519.53 mi (5,664.14 km) |
| Catonsville to Immingham | 3,588.42 mi (5,775.01 km) |
| Catonsville to Ince-in-Makerfield | 3,496.08 mi (5,626.39 km) |
| Catonsville to Inverness | 3,371.71 mi (5,426.24 km) |
| Catonsville to Inverurie | 3,441.76 mi (5,538.97 km) |
| Catonsville to Ipswich | 3,676.18 mi (5,916.24 km) |
| Catonsville to Irlam | 3,504.85 mi (5,640.51 km) |
| Catonsville to Irthlingborough | 3,599.29 mi (5,792.50 km) |
| Catonsville to Irvine | 3,381.40 mi (5,441.84 km) |
| Catonsville to Islington | 3,636.78 mi (5,852.83 km) |
