| Highgate to Ifield | 31.08 mi (50.03 km) |
| Highgate to Ilford | 9.95 mi (16.02 km) |
| Highgate to Ilfracombe | 173.20 mi (278.74 km) |
| Highgate to Ilkeston | 108.49 mi (174.60 km) |
| Highgate to Ilkley | 177.08 mi (284.98 km) |
| Highgate to Immingham | 141.14 mi (227.15 km) |
| Highgate to Ince-in-Makerfield | 170.65 mi (274.64 km) |
| Highgate to Inverness | 439.46 mi (707.24 km) |
| Highgate to Inverurie | 404.46 mi (650.91 km) |
| Highgate to Ipswich | 64.97 mi (104.56 km) |
| Highgate to Irlam | 161.00 mi (259.10 km) |
| Highgate to Irthlingborough | 55.69 mi (89.63 km) |
| Highgate to Irvine | 335.32 mi (539.65 km) |
| Highgate to Islington | 2.63 mi (4.23 km) |
| Highgate to Iver | 15.95 mi (25.67 km) |
