| Key West to Marshall (Minnesota) | 1,583.51 mi (2,548.41 km) |
| Key West to Marshall (Missouri) | 1,206.10 mi (1,941.02 km) |
| Key West to Marshall (Texas) | 939.95 mi (1,512.71 km) |
| Key West to Marshalltown (Iowa) | 1,364.66 mi (2,196.21 km) |
| Key West to Marshfield (Wisconsin) | 1,466.45 mi (2,360.02 km) |
| Key West to Martha Lake (Washington) | 2,722.93 mi (4,382.13 km) |
| Key West to Martin (Tennessee) | 915.43 mi (1,473.24 km) |
| Key West to Martinez (California) | 2,532.73 mi (4,076.04 km) |
| Key West to Martinez (Georgia) | 619.15 mi (996.43 km) |
| Key West to Martinsburg (West Virginia) | 1,052.59 mi (1,693.98 km) |
| Key West to Martinsville (Indiana) | 1,061.28 mi (1,707.96 km) |
| Key West to Martinsville (New Jersey) | 1,183.74 mi (1,905.04 km) |
| Key West to Martinsville (Virginia) | 844.94 mi (1,359.80 km) |
| Key West to Maryland City (Maryland) | 1,045.51 mi (1,682.58 km) |
| Key West to Maryland Heights (Missouri) | 1,102.37 mi (1,774.09 km) |
