| Harrow to La Union | 965.19 mi (1,553.32 km) |
| Harrow to La Victoria de Acentejo | 1,803.60 mi (2,902.61 km) |
| Harrow to Laguna de Duero | 721.11 mi (1,160.52 km) |
| Harrow to Lalin | 716.35 mi (1,152.85 km) |
| Harrow to Lardero | 640.45 mi (1,030.70 km) |
| Harrow to Laredo | 582.13 mi (936.85 km) |
| Harrow to Las Cabezas de San Juan | 1,045.37 mi (1,682.36 km) |
| Harrow to Las Palmas | 1,799.26 mi (2,895.63 km) |
| Harrow to Las Rozas de Madrid | 784.58 mi (1,262.66 km) |
| Harrow to Las Torres de Cotillas | 937.72 mi (1,509.12 km) |
| Harrow to Lebrija | 1,051.34 mi (1,691.96 km) |
| Harrow to Leganes | 794.59 mi (1,278.77 km) |
| Harrow to Leon | 666.78 mi (1,073.08 km) |
| Harrow to Lepe | 1,045.15 mi (1,682.01 km) |
| Harrow to Linares | 946.33 mi (1,522.97 km) |
