| Niagara Falls to Ickenham | 3,545.27 mi (5,705.56 km) |
| Niagara Falls to Ifield | 3,566.88 mi (5,740.34 km) |
| Niagara Falls to Ilford | 3,566.30 mi (5,739.40 km) |
| Niagara Falls to Ilfracombe | 3,408.36 mi (5,485.22 km) |
| Niagara Falls to Ilkeston | 3,473.99 mi (5,590.84 km) |
| Niagara Falls to Ilkley | 3,430.28 mi (5,520.51 km) |
| Niagara Falls to Immingham | 3,499.09 mi (5,631.25 km) |
| Niagara Falls to Ince-in-Makerfield | 3,410.02 mi (5,487.90 km) |
| Niagara Falls to Inverness | 3,263.35 mi (5,251.86 km) |
| Niagara Falls to Inverurie | 3,333.05 mi (5,364.03 km) |
| Niagara Falls to Ipswich | 3,593.98 mi (5,783.96 km) |
| Niagara Falls to Irlam | 3,419.16 mi (5,502.60 km) |
| Niagara Falls to Irthlingborough | 3,517.95 mi (5,661.60 km) |
| Niagara Falls to Irvine | 3,284.85 mi (5,286.46 km) |
| Niagara Falls to Islington | 3,559.26 mi (5,728.08 km) |
