| San Marcos to Mendota (California) | 308.97 mi (497.23 km) |
| San Marcos to Mendota Heights (Minnesota) | 1,515.48 mi (2,438.93 km) |
| San Marcos to Menifee (California) | 38.41 mi (61.82 km) |
| San Marcos to Menlo Park (California) | 410.86 mi (661.22 km) |
| San Marcos to Menomonee Falls (Wisconsin) | 1,712.36 mi (2,755.78 km) |
| San Marcos to Menomonie (Wisconsin) | 1,571.10 mi (2,528.44 km) |
| San Marcos to Mentor (Ohio) | 2,037.21 mi (3,278.58 km) |
| San Marcos to Mequon (Wisconsin) | 1,720.60 mi (2,769.04 km) |
| San Marcos to Merced (California) | 343.18 mi (552.29 km) |
| San Marcos to Mercedes (Texas) | 1,250.67 mi (2,012.75 km) |
| San Marcos to Mercer Island (Washington) | 1,031.46 mi (1,659.97 km) |
| San Marcos to Mercerville (New Jersey) | 2,381.00 mi (3,831.85 km) |
| San Marcos to Meriden (Connecticut) | 2,477.68 mi (3,987.43 km) |
| San Marcos to Meridian (Idaho) | 725.07 mi (1,166.89 km) |
| San Marcos to Meridian (Mississippi) | 1,650.78 mi (2,656.68 km) |
