| South San Francisco to Mattoon (Illinois) | 1,833.27 mi (2,950.36 km) |
| South San Francisco to Mauldin (South Carolina) | 2,228.00 mi (3,585.62 km) |
| South San Francisco to Maumee (Ohio) | 2,063.10 mi (3,320.25 km) |
| South San Francisco to Maumelle (Arkansas) | 1,676.60 mi (2,698.22 km) |
| South San Francisco to Mayagüez (Puerto Rico) | 3,575.14 mi (5,753.63 km) |
| South San Francisco to Mayfield Heights (Ohio) | 2,177.14 mi (3,503.76 km) |
| South San Francisco to Mays Chapel (Maryland) | 2,449.62 mi (3,942.29 km) |
| South San Francisco to Maywood (California) | 346.82 mi (558.15 km) |
| South San Francisco to Maywood (Illinois) | 1,846.57 mi (2,971.77 km) |
| South San Francisco to McAlester (Oklahoma) | 1,490.82 mi (2,399.24 km) |
| South San Francisco to McAllen (Texas) | 1,615.37 mi (2,599.69 km) |
| South San Francisco to McCalla (Alabama) | 2,001.76 mi (3,221.53 km) |
| South San Francisco to McComb (Mississippi) | 1,863.66 mi (2,999.27 km) |
| South San Francisco to McDonough (Georgia) | 2,155.99 mi (3,469.73 km) |
| South San Francisco to McFarland (California) | 222.83 mi (358.60 km) |
