| Rio Grande City to Madison (Mississippi) | 670.95 mi (1,079.79 km) |
| Rio Grande City to Madison (New Jersey) | 1,710.96 mi (2,753.52 km) |
| Rio Grande City to Madison (Wisconsin) | 1,270.06 mi (2,043.96 km) |
| Rio Grande City to Madison Heights (Michigan) | 1,424.50 mi (2,292.50 km) |
| Rio Grande City to Madison Heights (Virginia) | 1,381.70 mi (2,223.63 km) |
| Rio Grande City to Madisonville (Kentucky) | 1,005.63 mi (1,618.40 km) |
| Rio Grande City to Magalia (California) | 1,605.25 mi (2,583.40 km) |
| Rio Grande City to Magna (Utah) | 1,252.64 mi (2,015.93 km) |
| Rio Grande City to Magnolia (Arkansas) | 582.46 mi (937.38 km) |
| Rio Grande City to Maili (Hawaii) | 3,732.83 mi (6,007.42 km) |
| Rio Grande City to Maitland (Florida) | 1,079.61 mi (1,737.46 km) |
| Rio Grande City to Makakilo (Hawaii) | 3,728.54 mi (6,000.50 km) |
| Rio Grande City to Malden (Massachusetts) | 1,918.10 mi (3,086.89 km) |
| Rio Grande City to Malibu (California) | 1,301.02 mi (2,093.79 km) |
| Rio Grande City to Maltby (Washington) | 1,943.31 mi (3,127.46 km) |
