| San Mateo to Mattoon (Illinois) | 1,829.36 mi (2,944.07 km) |
| San Mateo to Mauldin (South Carolina) | 2,223.07 mi (3,577.68 km) |
| San Mateo to Maumee (Ohio) | 2,059.96 mi (3,315.19 km) |
| San Mateo to Maumelle (Arkansas) | 1,671.04 mi (2,689.28 km) |
| San Mateo to Mayagüez (Puerto Rico) | 3,568.54 mi (5,743.02 km) |
| San Mateo to Mayfield Heights (Ohio) | 2,174.03 mi (3,498.76 km) |
| San Mateo to Mays Chapel (Maryland) | 2,446.12 mi (3,936.65 km) |
| San Mateo to Maywood (California) | 337.69 mi (543.45 km) |
| San Mateo to Maywood (Illinois) | 1,843.46 mi (2,966.77 km) |
| San Mateo to McAlester (Oklahoma) | 1,485.05 mi (2,389.96 km) |
| San Mateo to McAllen (Texas) | 1,607.27 mi (2,586.66 km) |
| San Mateo to McCalla (Alabama) | 1,996.16 mi (3,212.51 km) |
| San Mateo to McComb (Mississippi) | 1,857.29 mi (2,989.02 km) |
| San Mateo to McDonough (Georgia) | 2,150.62 mi (3,461.09 km) |
| San Mateo to McFarland (California) | 213.92 mi (344.27 km) |
