| Harrow to Miedzychod | 691.05 mi (1,112.14 km) |
| Harrow to Miedzyrzec Podlaski | 984.86 mi (1,584.97 km) |
| Harrow to Miedzyrzecz | 678.83 mi (1,092.47 km) |
| Harrow to Mielec | 949.07 mi (1,527.38 km) |
| Harrow to Mikolow | 842.33 mi (1,355.59 km) |
| Harrow to Milanowek | 895.05 mi (1,440.44 km) |
| Harrow to Milicz | 755.48 mi (1,215.82 km) |
| Harrow to Minsk Mazowiecki | 931.92 mi (1,499.78 km) |
| Harrow to Mlawa | 877.45 mi (1,412.12 km) |
| Harrow to Mogilno | 777.63 mi (1,251.48 km) |
| Harrow to Monki | 978.09 mi (1,574.09 km) |
| Harrow to Morag | 860.19 mi (1,384.34 km) |
| Harrow to Mosina | 732.38 mi (1,178.65 km) |
| Harrow to Mragowo | 915.70 mi (1,473.68 km) |
| Harrow to Murowana Goslina | 738.67 mi (1,188.77 km) |
