| San Mateo to McHenry (Illinois) | 1,819.56 mi (2,928.29 km) |
| San Mateo to McKeesport (Pennsylvania) | 2,268.30 mi (3,650.48 km) |
| San Mateo to McKinleyville (California) | 253.13 mi (407.37 km) |
| San Mateo to McKinney (Texas) | 1,470.82 mi (2,367.05 km) |
| San Mateo to McLean (Virginia) | 2,424.78 mi (3,902.31 km) |
| San Mateo to McMinnville (Oregon) | 531.12 mi (854.76 km) |
| San Mateo to McMinnville (Tennessee) | 2,017.21 mi (3,246.38 km) |
| San Mateo to McNair (Virginia) | 2,413.26 mi (3,883.77 km) |
| San Mateo to McPherson (Kansas) | 1,340.09 mi (2,156.66 km) |
| San Mateo to Mead Valley (California) | 381.45 mi (613.89 km) |
| San Mateo to Meadow Woods (Florida) | 2,437.53 mi (3,922.82 km) |
| San Mateo to Meadowbrook (Virginia) | 2,434.04 mi (3,917.20 km) |
| San Mateo to Meadville (Pennsylvania) | 2,240.04 mi (3,605.00 km) |
| San Mateo to Mebane (North Carolina) | 2,361.74 mi (3,800.85 km) |
| San Mateo to Mechanicsville (Virginia) | 2,436.98 mi (3,921.94 km) |
