| Issum to Lagoa | 1,817.75 mi (2,925.38 km) |
| Issum to Lagos | 1,240.47 mi (1,996.35 km) |
| Issum to Lamego | 987.28 mi (1,588.87 km) |
| Issum to Leiria | 1,093.01 mi (1,759.03 km) |
| Issum to Lisbon | 1,161.28 mi (1,868.91 km) |
| Issum to Loule | 1,218.47 mi (1,960.93 km) |
| Issum to Loures | 1,155.72 mi (1,859.96 km) |
| Issum to Lourinha | 1,137.57 mi (1,830.74 km) |
| Issum to Lousa | 1,055.41 mi (1,698.51 km) |
| Issum to Lousada | 990.60 mi (1,594.22 km) |
| Issum to Macedo de Cavaleiros | 936.27 mi (1,506.78 km) |
| Issum to Mafamude | 1,012.48 mi (1,629.43 km) |
| Issum to Mafra | 1,154.87 mi (1,858.58 km) |
| Issum to Maia | 1,006.64 mi (1,620.03 km) |
| Issum to Mangualde | 1,012.88 mi (1,630.08 km) |
