| Key West to McKeesport (Pennsylvania) | 1,095.86 mi (1,763.61 km) |
| Key West to McKinleyville (California) | 2,673.68 mi (4,302.88 km) |
| Key West to McKinney (Texas) | 1,078.69 mi (1,735.98 km) |
| Key West to McLean (Virginia) | 1,028.96 mi (1,655.95 km) |
| Key West to McMinnville (Oregon) | 2,704.65 mi (4,352.71 km) |
| Key West to McMinnville (Tennessee) | 804.63 mi (1,294.92 km) |
| Key West to McNair (Virginia) | 1,026.24 mi (1,651.58 km) |
| Key West to McPherson (Kansas) | 1,332.53 mi (2,144.50 km) |
| Key West to Mead Valley (California) | 2,222.89 mi (3,577.39 km) |
| Key West to Meadow Woods (Florida) | 264.29 mi (425.33 km) |
| Key West to Meadowbrook (Virginia) | 924.45 mi (1,487.76 km) |
| Key West to Meadville (Pennsylvania) | 1,184.05 mi (1,905.55 km) |
| Key West to Mebane (North Carolina) | 809.82 mi (1,303.27 km) |
| Key West to Mechanicsville (Virginia) | 939.32 mi (1,511.68 km) |
| Key West to Medford (Massachusetts) | 1,375.89 mi (2,214.29 km) |
