| Guaynabo to Mauldin (South Carolina) | 1,507.04 mi (2,425.34 km) |
| Guaynabo to Maumee (Ohio) | 1,907.16 mi (3,069.28 km) |
| Guaynabo to Maumelle (Arkansas) | 1,972.26 mi (3,174.05 km) |
| Guaynabo to Mayagüez (Puerto Rico) | 68.50 mi (110.24 km) |
| Guaynabo to Mayfield Heights (Ohio) | 1,836.84 mi (2,956.10 km) |
| Guaynabo to Mays Chapel (Maryland) | 1,585.16 mi (2,551.06 km) |
| Guaynabo to Maywood (California) | 3,365.27 mi (5,415.87 km) |
| Guaynabo to Maywood (Illinois) | 2,066.09 mi (3,325.05 km) |
| Guaynabo to McAlester (Oklahoma) | 2,145.74 mi (3,453.24 km) |
| Guaynabo to McAllen (Texas) | 2,118.14 mi (3,408.82 km) |
| Guaynabo to McCalla (Alabama) | 1,653.59 mi (2,661.19 km) |
| Guaynabo to McComb (Mississippi) | 1,760.90 mi (2,833.89 km) |
| Guaynabo to McDonough (Georgia) | 1,524.59 mi (2,453.59 km) |
| Guaynabo to McFarland (California) | 3,435.60 mi (5,529.06 km) |
| Guaynabo to McHenry (Illinois) | 2,104.79 mi (3,387.34 km) |
