| Witham to Ickenham | 49.38 mi (79.47 km) |
| Witham to Ifield | 59.10 mi (95.12 km) |
| Witham to Ilford | 28.88 mi (46.48 km) |
| Witham to Ilfracombe | 208.58 mi (335.68 km) |
| Witham to Ilkeston | 115.35 mi (185.64 km) |
| Witham to Ilkley | 179.21 mi (288.42 km) |
| Witham to Immingham | 130.49 mi (210.00 km) |
| Witham to Ince-in-Makerfield | 181.30 mi (291.77 km) |
| Witham to Inverness | 437.70 mi (704.42 km) |
| Witham to Inverurie | 397.52 mi (639.75 km) |
| Witham to Ipswich | 28.54 mi (45.93 km) |
| Witham to Irlam | 171.49 mi (275.99 km) |
| Witham to Irthlingborough | 64.40 mi (103.64 km) |
| Witham to Irvine | 341.42 mi (549.46 km) |
| Witham to Islington | 36.23 mi (58.31 km) |
