| San Marcos to Montgomeryville (Pennsylvania) | 2,352.04 mi (3,785.24 km) |
| San Marcos to Monticello (Minnesota) | 1,498.53 mi (2,411.65 km) |
| San Marcos to Montrose (Colorado) | 638.44 mi (1,027.46 km) |
| San Marcos to Moody (Alabama) | 1,764.02 mi (2,838.91 km) |
| San Marcos to Moore (Oklahoma) | 1,133.51 mi (1,824.22 km) |
| San Marcos to Moorestown-Lenola (New Jersey) | 2,367.24 mi (3,809.71 km) |
| San Marcos to Mooresville (North Carolina) | 2,068.36 mi (3,328.70 km) |
| San Marcos to Moorhead (Minnesota) | 1,430.61 mi (2,302.34 km) |
| San Marcos to Moorpark (California) | 126.09 mi (202.93 km) |
| San Marcos to Moraga (California) | 428.04 mi (688.87 km) |
| San Marcos to Moreno Valley (California) | 54.57 mi (87.82 km) |
| San Marcos to Morgan City (Louisiana) | 1,546.15 mi (2,488.29 km) |
| San Marcos to Morgan Hill (California) | 374.08 mi (602.03 km) |
| San Marcos to Morganton (North Carolina) | 2,018.49 mi (3,248.45 km) |
| San Marcos to Morgantown (West Virginia) | 2,103.16 mi (3,384.70 km) |
