| Harrow to Melzo | 612.34 mi (985.47 km) |
| Harrow to Mendicino | 1,164.33 mi (1,873.81 km) |
| Harrow to Menfi | 1,162.88 mi (1,871.47 km) |
| Harrow to Mentana | 900.03 mi (1,448.46 km) |
| Harrow to Merano | 620.13 mi (998.00 km) |
| Harrow to Merate | 602.89 mi (970.26 km) |
| Harrow to Mercato San Severino | 1,035.06 mi (1,665.77 km) |
| Harrow to Mercogliano | 1,026.76 mi (1,652.42 km) |
| Harrow to Mesagne | 1,150.11 mi (1,850.92 km) |
| Harrow to Messina | 1,203.67 mi (1,937.12 km) |
| Harrow to Mestre | 711.64 mi (1,145.27 km) |
| Harrow to Mestrino | 696.33 mi (1,120.64 km) |
| Harrow to Milan | 606.56 mi (976.17 km) |
| Harrow to Milazzo | 1,192.59 mi (1,919.29 km) |
| Harrow to Minerbio | 725.75 mi (1,167.98 km) |
