| Mason City to Ickenham | 4,081.86 mi (6,569.11 km) |
| Mason City to Ifield | 4,106.60 mi (6,608.94 km) |
| Mason City to Ilford | 4,101.34 mi (6,600.46 km) |
| Mason City to Ilfracombe | 3,958.36 mi (6,370.37 km) |
| Mason City to Ilkeston | 4,000.13 mi (6,437.59 km) |
| Mason City to Ilkley | 3,948.75 mi (6,354.91 km) |
| Mason City to Immingham | 4,016.13 mi (6,463.34 km) |
| Mason City to Ince-in-Makerfield | 3,934.29 mi (6,331.62 km) |
| Mason City to Inverness | 3,751.16 mi (6,036.92 km) |
| Mason City to Inverurie | 3,818.67 mi (6,145.56 km) |
| Mason City to Ipswich | 4,121.39 mi (6,632.74 km) |
| Mason City to Irlam | 3,943.86 mi (6,347.03 km) |
| Mason City to Irthlingborough | 4,048.12 mi (6,514.82 km) |
| Mason City to Irvine | 3,793.56 mi (6,105.15 km) |
| Mason City to Islington | 4,094.97 mi (6,590.22 km) |
