| Key Largo to Marshall (Minnesota) | 1,589.11 mi (2,557.42 km) |
| Key Largo to Marshall (Missouri) | 1,219.83 mi (1,963.13 km) |
| Key Largo to Marshall (Texas) | 985.72 mi (1,586.37 km) |
| Key Largo to Marshalltown (Iowa) | 1,368.69 mi (2,202.69 km) |
| Key Largo to Marshfield (Wisconsin) | 1,456.43 mi (2,343.90 km) |
| Key Largo to Martha Lake (Washington) | 2,754.34 mi (4,432.69 km) |
| Key Largo to Martin (Tennessee) | 921.96 mi (1,483.75 km) |
| Key Largo to Martinez (California) | 2,586.46 mi (4,162.50 km) |
| Key Largo to Martinez (Georgia) | 589.08 mi (948.03 km) |
| Key Largo to Martinsburg (West Virginia) | 1,000.54 mi (1,610.22 km) |
| Key Largo to Martinsville (Indiana) | 1,047.58 mi (1,685.91 km) |
| Key Largo to Martinsville (New Jersey) | 1,121.25 mi (1,804.48 km) |
| Key Largo to Martinsville (Virginia) | 799.39 mi (1,286.49 km) |
| Key Largo to Maryland City (Maryland) | 988.42 mi (1,590.71 km) |
| Key Largo to Maryland Heights (Missouri) | 1,107.70 mi (1,782.66 km) |
