| San Marino to McHenry (Illinois) | 1,704.67 mi (2,743.40 km) |
| San Marino to McKeesport (Pennsylvania) | 2,131.45 mi (3,430.23 km) |
| San Marino to McKinleyville (California) | 573.72 mi (923.31 km) |
| San Marino to McKinney (Texas) | 1,232.70 mi (1,983.85 km) |
| San Marino to McLean (Virginia) | 2,276.77 mi (3,664.11 km) |
| San Marino to McMinnville (Oregon) | 811.93 mi (1,306.67 km) |
| San Marino to McMinnville (Tennessee) | 1,827.00 mi (2,940.26 km) |
| San Marino to McNair (Virginia) | 2,265.10 mi (3,645.32 km) |
| San Marino to McPherson (Kansas) | 1,174.15 mi (1,889.61 km) |
| San Marino to Mead Valley (California) | 51.47 mi (82.84 km) |
| San Marino to Meadow Woods (Florida) | 2,195.85 mi (3,533.87 km) |
| San Marino to Meadowbrook (Virginia) | 2,271.93 mi (3,656.32 km) |
| San Marino to Meadville (Pennsylvania) | 2,116.34 mi (3,405.92 km) |
| San Marino to Mebane (North Carolina) | 2,185.08 mi (3,516.55 km) |
| San Marino to Mechanicsville (Virginia) | 2,276.79 mi (3,664.14 km) |
