| Rio Grande City to Malvern (Arkansas) | 657.62 mi (1,058.34 km) |
| Rio Grande City to Manassas (Virginia) | 1,501.79 mi (2,416.90 km) |
| Rio Grande City to Manassas Park (Virginia) | 1,504.49 mi (2,421.24 km) |
| Rio Grande City to Manatí (Puerto Rico) | 2,131.19 mi (3,429.81 km) |
| Rio Grande City to Manchester (Missouri) | 971.38 mi (1,563.29 km) |
| Rio Grande City to Manchester (New Hampshire) | 1,918.05 mi (3,086.80 km) |
| Rio Grande City to Manchester (Tennessee) | 980.44 mi (1,577.87 km) |
| Rio Grande City to Manchester (Virginia) | 1,459.70 mi (2,349.16 km) |
| Rio Grande City to Mandan (North Dakota) | 1,417.34 mi (2,280.99 km) |
| Rio Grande City to Mandeville (Louisiana) | 597.95 mi (962.30 km) |
| Rio Grande City to Mango (Florida) | 1,020.28 mi (1,641.98 km) |
| Rio Grande City to Manhattan (Kansas) | 894.16 mi (1,439.02 km) |
| Rio Grande City to Manhattan (New York) | 1,732.65 mi (2,788.43 km) |
| Rio Grande City to Manhattan Beach (California) | 1,276.73 mi (2,054.71 km) |
| Rio Grande City to Manitowoc (Wisconsin) | 1,373.17 mi (2,209.90 km) |
