| San Marino to Maryland Heights (Missouri) | 1,562.83 mi (2,515.12 km) |
| San Marino to Marysville (California) | 397.12 mi (639.11 km) |
| San Marino to Marysville (Ohio) | 1,946.13 mi (3,131.99 km) |
| San Marino to Marysville (Washington) | 986.77 mi (1,588.06 km) |
| San Marino to Maryville (Missouri) | 1,344.22 mi (2,163.31 km) |
| San Marino to Maryville (Tennessee) | 1,926.99 mi (3,101.20 km) |
| San Marino to Mason (Ohio) | 1,895.22 mi (3,050.06 km) |
| San Marino to Mason City (Iowa) | 1,474.71 mi (2,373.32 km) |
| San Marino to Massapequa (New York) | 2,464.96 mi (3,966.97 km) |
| San Marino to Massapequa Park (New York) | 2,465.99 mi (3,968.62 km) |
| San Marino to Massillon (Ohio) | 2,043.28 mi (3,288.34 km) |
| San Marino to Mastic (New York) | 2,496.76 mi (4,018.14 km) |
| San Marino to Mastic Beach (New York) | 2,497.56 mi (4,019.43 km) |
| San Marino to Matteson (Illinois) | 1,724.10 mi (2,774.67 km) |
| San Marino to Matthews (North Carolina) | 2,115.23 mi (3,404.13 km) |
