| Key West to Mitchell (South Dakota) | 1,611.34 mi (2,593.19 km) |
| Key West to Mitchellville (Maryland) | 1,034.44 mi (1,664.77 km) |
| Key West to Moberly (Missouri) | 1,199.31 mi (1,930.10 km) |
| Key West to Mobile (Alabama) | 573.36 mi (922.73 km) |
| Key West to Modesto (California) | 2,468.62 mi (3,972.85 km) |
| Key West to Mokena (Illinois) | 1,223.63 mi (1,969.23 km) |
| Key West to Moline (Illinois) | 1,271.56 mi (2,046.37 km) |
| Key West to Moncks Corner (South Carolina) | 604.31 mi (972.54 km) |
| Key West to Monfort Heights (Ohio) | 1,023.41 mi (1,647.02 km) |
| Key West to Monmouth (Oregon) | 2,698.90 mi (4,343.46 km) |
| Key West to Monroe (Georgia) | 648.65 mi (1,043.90 km) |
| Key West to Monroe (Louisiana) | 831.54 mi (1,338.23 km) |
| Key West to Monroe (Michigan) | 1,202.39 mi (1,935.06 km) |
| Key West to Monroe (North Carolina) | 725.15 mi (1,167.01 km) |
| Key West to Monroe (Ohio) | 1,039.23 mi (1,672.49 km) |
