| Thornaby on Tees to Ickenham | 210.32 mi (338.48 km) |
| Thornaby on Tees to Ifield | 241.70 mi (388.97 km) |
| Thornaby on Tees to Ilford | 215.20 mi (346.34 km) |
| Thornaby on Tees to Ilfracombe | 259.55 mi (417.70 km) |
| Thornaby on Tees to Ilkeston | 109.69 mi (176.52 km) |
| Thornaby on Tees to Ilkley | 48.54 mi (78.11 km) |
| Thornaby on Tees to Immingham | 78.68 mi (126.62 km) |
| Thornaby on Tees to Ince-in-Makerfield | 87.84 mi (141.36 km) |
| Thornaby on Tees to Inverness | 231.08 mi (371.88 km) |
| Thornaby on Tees to Inverurie | 192.60 mi (309.96 km) |
| Thornaby on Tees to Ipswich | 200.25 mi (322.28 km) |
| Thornaby on Tees to Irlam | 89.36 mi (143.81 km) |
| Thornaby on Tees to Irthlingborough | 156.97 mi (252.61 km) |
| Thornaby on Tees to Irvine | 151.70 mi (244.14 km) |
| Thornaby on Tees to Islington | 214.15 mi (344.64 km) |
