| Middle River to Montijo | 3,641.60 mi (5,860.59 km) |
| Middle River to Montilla | 3,777.91 mi (6,079.95 km) |
| Middle River to Montmelo | 3,987.51 mi (6,417.27 km) |
| Middle River to Montornes del Valles | 3,988.61 mi (6,419.04 km) |
| Middle River to Montoro | 3,777.22 mi (6,078.85 km) |
| Middle River to Monzon | 3,881.14 mi (6,246.08 km) |
| Middle River to Mora | 3,757.71 mi (6,047.45 km) |
| Middle River to Moralzarzal | 3,720.17 mi (5,987.04 km) |
| Middle River to Moron de la Frontera | 3,751.30 mi (6,037.13 km) |
| Middle River to Mostoles | 3,734.76 mi (6,010.52 km) |
| Middle River to Motril | 3,858.51 mi (6,209.67 km) |
| Middle River to Muchamiel | 3,956.83 mi (6,367.91 km) |
| Middle River to Mula | 3,917.77 mi (6,305.05 km) |
| Middle River to Munguia | 3,699.55 mi (5,953.85 km) |
| Middle River to Murcia | 3,937.02 mi (6,336.02 km) |
