| Potomac to Ickenham | 3,652.04 mi (5,877.39 km) |
| Potomac to Ifield | 3,671.50 mi (5,908.71 km) |
| Potomac to Ilford | 3,673.80 mi (5,912.41 km) |
| Potomac to Ilfracombe | 3,508.18 mi (5,645.86 km) |
| Potomac to Ilkeston | 3,587.80 mi (5,774.00 km) |
| Potomac to Ilkley | 3,549.05 mi (5,711.64 km) |
| Potomac to Immingham | 3,617.94 mi (5,822.51 km) |
| Potomac to Ince-in-Makerfield | 3,525.63 mi (5,673.96 km) |
| Potomac to Inverness | 3,400.87 mi (5,473.17 km) |
| Potomac to Inverurie | 3,470.91 mi (5,585.90 km) |
| Potomac to Ipswich | 3,705.79 mi (5,963.89 km) |
| Potomac to Irlam | 3,534.41 mi (5,688.08 km) |
| Potomac to Irthlingborough | 3,628.90 mi (5,840.15 km) |
| Potomac to Irvine | 3,410.79 mi (5,489.14 km) |
| Potomac to Islington | 3,666.43 mi (5,900.55 km) |
