| Potters Bar to Montijo | 936.35 mi (1,506.92 km) |
| Potters Bar to Montilla | 998.99 mi (1,607.72 km) |
| Potters Bar to Montmelo | 710.17 mi (1,142.91 km) |
| Potters Bar to Montornes del Valles | 711.00 mi (1,144.25 km) |
| Potters Bar to Montoro | 966.99 mi (1,556.23 km) |
| Potters Bar to Monzon | 676.51 mi (1,088.74 km) |
| Potters Bar to Mora | 847.74 mi (1,364.31 km) |
| Potters Bar to Moralzarzal | 782.58 mi (1,259.43 km) |
| Potters Bar to Moron de la Frontera | 1,039.43 mi (1,672.80 km) |
| Potters Bar to Mostoles | 804.60 mi (1,294.88 km) |
| Potters Bar to Motril | 1,045.63 mi (1,682.77 km) |
| Potters Bar to Muchamiel | 917.95 mi (1,477.30 km) |
| Potters Bar to Mula | 945.67 mi (1,521.92 km) |
| Potters Bar to Munguia | 589.61 mi (948.88 km) |
| Potters Bar to Murcia | 948.51 mi (1,526.49 km) |
