| South San Francisco to McHenry (Illinois) | 1,822.52 mi (2,933.06 km) |
| South San Francisco to McKeesport (Pennsylvania) | 2,271.69 mi (3,655.93 km) |
| South San Francisco to McKinleyville (California) | 244.46 mi (393.41 km) |
| South San Francisco to McKinney (Texas) | 1,477.19 mi (2,377.31 km) |
| South San Francisco to McLean (Virginia) | 2,428.43 mi (3,908.18 km) |
| South San Francisco to McMinnville (Oregon) | 523.67 mi (842.77 km) |
| South San Francisco to McMinnville (Tennessee) | 2,022.12 mi (3,254.29 km) |
| South San Francisco to McNair (Virginia) | 2,416.92 mi (3,889.66 km) |
| South San Francisco to McPherson (Kansas) | 1,344.68 mi (2,164.05 km) |
| South San Francisco to Mead Valley (California) | 390.50 mi (628.44 km) |
| South San Francisco to Meadow Woods (Florida) | 2,443.75 mi (3,932.84 km) |
| South San Francisco to Meadowbrook (Virginia) | 2,438.07 mi (3,923.69 km) |
| South San Francisco to Meadville (Pennsylvania) | 2,243.08 mi (3,609.88 km) |
| South San Francisco to Mebane (North Carolina) | 2,366.19 mi (3,808.01 km) |
| South San Francisco to Mechanicsville (Virginia) | 2,440.96 mi (3,928.35 km) |
