| Boulder to Ickenham | 4,666.44 mi (7,509.91 km) |
| Boulder to Ifield | 4,692.79 mi (7,552.32 km) |
| Boulder to Ilford | 4,684.80 mi (7,539.46 km) |
| Boulder to Ilfracombe | 4,551.93 mi (7,325.62 km) |
| Boulder to Ilkeston | 4,579.37 mi (7,369.78 km) |
| Boulder to Ilkley | 4,523.98 mi (7,280.65 km) |
| Boulder to Immingham | 4,589.73 mi (7,386.46 km) |
| Boulder to Ince-in-Makerfield | 4,513.13 mi (7,263.17 km) |
| Boulder to Inverness | 4,310.44 mi (6,936.98 km) |
| Boulder to Inverurie | 4,375.66 mi (7,041.94 km) |
| Boulder to Ipswich | 4,700.09 mi (7,564.06 km) |
| Boulder to Irlam | 4,522.85 mi (7,278.83 km) |
| Boulder to Irthlingborough | 4,629.23 mi (7,450.03 km) |
| Boulder to Irvine | 4,364.83 mi (7,024.52 km) |
| Boulder to Islington | 4,678.90 mi (7,529.96 km) |
