| Marinha Grande to Ifield | 891.02 mi (1,433.96 km) |
| Marinha Grande to Ilford | 923.20 mi (1,485.75 km) |
| Marinha Grande to Ilfracombe | 824.84 mi (1,327.45 km) |
| Marinha Grande to Ilkeston | 981.83 mi (1,580.10 km) |
| Marinha Grande to Ilkley | 1,034.20 mi (1,664.38 km) |
| Marinha Grande to Immingham | 1,041.35 mi (1,675.88 km) |
| Marinha Grande to Ince-in-Makerfield | 998.08 mi (1,606.26 km) |
| Marinha Grande to Inverness | 1,242.88 mi (2,000.22 km) |
| Marinha Grande to Inverurie | 1,246.40 mi (2,005.89 km) |
| Marinha Grande to Ipswich | 976.99 mi (1,572.31 km) |
| Marinha Grande to Irlam | 994.42 mi (1,600.37 km) |
| Marinha Grande to Irthlingborough | 954.54 mi (1,536.18 km) |
| Marinha Grande to Irvine | 1,113.85 mi (1,792.56 km) |
| Marinha Grande to Islington | 918.22 mi (1,477.72 km) |
| Marinha Grande to Iver | 908.08 mi (1,461.41 km) |
