| Harrow to Manerbio | 643.02 mi (1,034.85 km) |
| Harrow to Manfredonia | 1,029.51 mi (1,656.84 km) |
| Harrow to Maniago | 700.22 mi (1,126.89 km) |
| Harrow to Mantova | 675.84 mi (1,087.66 km) |
| Harrow to Maranello | 709.48 mi (1,141.80 km) |
| Harrow to Marano di Napoli | 1,009.77 mi (1,625.07 km) |
| Harrow to Marano Vicentino | 672.81 mi (1,082.78 km) |
| Harrow to Marcianise | 1,006.34 mi (1,619.54 km) |
| Harrow to Marcon | 711.03 mi (1,144.29 km) |
| Harrow to Mareno di Piave | 700.32 mi (1,127.05 km) |
| Harrow to Margherita di Savoia | 1,051.26 mi (1,691.83 km) |
| Harrow to Mariano Comense | 594.55 mi (956.83 km) |
| Harrow to Marigliano | 1,016.62 mi (1,636.09 km) |
| Harrow to Marino | 914.17 mi (1,471.22 km) |
| Harrow to Marostica | 678.81 mi (1,092.43 km) |
