| San Juan to Mattoon (Illinois) | 1,973.43 mi (3,175.93 km) |
| San Juan to Mauldin (South Carolina) | 1,508.33 mi (2,427.42 km) |
| San Juan to Maumee (Ohio) | 1,907.91 mi (3,070.49 km) |
| San Juan to Maumelle (Arkansas) | 1,974.19 mi (3,177.15 km) |
| San Juan to Mayagüez (Puerto Rico) | 72.07 mi (115.99 km) |
| San Juan to Mayfield Heights (Ohio) | 1,837.41 mi (2,957.03 km) |
| San Juan to Mays Chapel (Maryland) | 1,585.42 mi (2,551.49 km) |
| San Juan to Maywood (California) | 3,367.74 mi (5,419.85 km) |
| San Juan to Maywood (Illinois) | 2,067.11 mi (3,326.69 km) |
| San Juan to McAlester (Oklahoma) | 2,147.79 mi (3,456.54 km) |
| San Juan to McAllen (Texas) | 2,120.98 mi (3,413.39 km) |
| San Juan to McCalla (Alabama) | 1,655.40 mi (2,664.11 km) |
| San Juan to McComb (Mississippi) | 1,763.11 mi (2,837.45 km) |
| San Juan to McDonough (Georgia) | 1,526.19 mi (2,456.16 km) |
| San Juan to McFarland (California) | 3,437.97 mi (5,532.88 km) |
