| Rancho San Diego to Mattoon (Illinois) | 1,652.14 mi (2,658.86 km) |
| Rancho San Diego to Mauldin (South Carolina) | 1,983.27 mi (3,191.76 km) |
| Rancho San Diego to Maumee (Ohio) | 1,915.75 mi (3,083.11 km) |
| Rancho San Diego to Maumelle (Arkansas) | 1,411.54 mi (2,271.66 km) |
| Rancho San Diego to Mayagüez (Puerto Rico) | 3,231.86 mi (5,201.17 km) |
| Rancho San Diego to Mayfield Heights (Ohio) | 2,028.86 mi (3,265.13 km) |
| Rancho San Diego to Mays Chapel (Maryland) | 2,275.37 mi (3,661.86 km) |
| Rancho San Diego to Maywood (California) | 111.94 mi (180.15 km) |
| Rancho San Diego to Maywood (Illinois) | 1,707.02 mi (2,747.19 km) |
| Rancho San Diego to McAlester (Oklahoma) | 1,220.36 mi (1,963.98 km) |
| Rancho San Diego to McAllen (Texas) | 1,208.18 mi (1,944.37 km) |
| Rancho San Diego to McCalla (Alabama) | 1,725.80 mi (2,777.41 km) |
| Rancho San Diego to McComb (Mississippi) | 1,549.19 mi (2,493.18 km) |
| Rancho San Diego to McDonough (Georgia) | 1,889.36 mi (3,040.63 km) |
| Rancho San Diego to McFarland (California) | 241.18 mi (388.14 km) |
