| San Marino to Mattoon (Illinois) | 1,678.89 mi (2,701.92 km) |
| San Marino to Mauldin (South Carolina) | 2,029.83 mi (3,266.70 km) |
| San Marino to Maumee (Ohio) | 1,934.63 mi (3,113.48 km) |
| San Marino to Maumelle (Arkansas) | 1,461.23 mi (2,351.62 km) |
| San Marino to Mayagüez (Puerto Rico) | 3,309.68 mi (5,326.41 km) |
| San Marino to Mayfield Heights (Ohio) | 2,048.54 mi (3,296.81 km) |
| San Marino to Mays Chapel (Maryland) | 2,303.20 mi (3,706.64 km) |
| San Marino to Maywood (California) | 10.18 mi (16.38 km) |
| San Marino to Maywood (Illinois) | 1,722.54 mi (2,772.17 km) |
| San Marino to McAlester (Oklahoma) | 1,270.27 mi (2,044.31 km) |
| San Marino to McAllen (Texas) | 1,302.99 mi (2,096.96 km) |
| San Marino to McCalla (Alabama) | 1,780.46 mi (2,865.37 km) |
| San Marino to McComb (Mississippi) | 1,614.75 mi (2,598.70 km) |
| San Marino to McDonough (Georgia) | 1,941.93 mi (3,125.23 km) |
| San Marino to McFarland (California) | 125.06 mi (201.26 km) |
