| Rio Grande City to Montijo | 5,208.78 mi (8,382.73 km) |
| Rio Grande City to Montilla | 5,343.71 mi (8,599.87 km) |
| Rio Grande City to Montmelo | 5,558.17 mi (8,945.01 km) |
| Rio Grande City to Montornes del Valles | 5,559.27 mi (8,946.79 km) |
| Rio Grande City to Montoro | 5,344.16 mi (8,600.60 km) |
| Rio Grande City to Monzon | 5,452.06 mi (8,774.25 km) |
| Rio Grande City to Mora | 5,327.66 mi (8,574.05 km) |
| Rio Grande City to Moralzarzal | 5,290.98 mi (8,515.01 km) |
| Rio Grande City to Moron de la Frontera | 5,315.21 mi (8,554.00 km) |
| Rio Grande City to Mostoles | 5,305.33 mi (8,538.10 km) |
| Rio Grande City to Motril | 5,423.32 mi (8,728.00 km) |
| Rio Grande City to Muchamiel | 5,526.73 mi (8,894.42 km) |
| Rio Grande City to Mula | 5,486.66 mi (8,829.93 km) |
| Rio Grande City to Munguia | 5,270.17 mi (8,481.52 km) |
| Rio Grande City to Murcia | 5,506.03 mi (8,861.10 km) |
