| Rio Grande City to Mill Creek (Washington) | 1,949.53 mi (3,137.46 km) |
| Rio Grande City to Mill Creek East (Washington) | 1,947.74 mi (3,134.59 km) |
| Rio Grande City to Mill Valley (California) | 1,593.10 mi (2,563.85 km) |
| Rio Grande City to Millbrae (California) | 1,577.78 mi (2,539.20 km) |
| Rio Grande City to Millbrook (Alabama) | 859.25 mi (1,382.84 km) |
| Rio Grande City to Millcreek (Utah) | 1,237.36 mi (1,991.34 km) |
| Rio Grande City to Milledgeville (Georgia) | 1,041.71 mi (1,676.47 km) |
| Rio Grande City to Miller Place (New York) | 1,783.15 mi (2,869.70 km) |
| Rio Grande City to Millington (Tennessee) | 813.32 mi (1,308.91 km) |
| Rio Grande City to Millville (New Jersey) | 1,637.90 mi (2,635.95 km) |
| Rio Grande City to Milpitas (California) | 1,547.57 mi (2,490.57 km) |
| Rio Grande City to Milton (Georgia) | 1,016.55 mi (1,635.97 km) |
| Rio Grande City to Milwaukee (Wisconsin) | 1,304.50 mi (2,099.39 km) |
| Rio Grande City to Milwaukie (Oregon) | 1,859.43 mi (2,992.47 km) |
| Rio Grande City to Minden (Louisiana) | 544.72 mi (876.65 km) |
