| San Marcos to Missouri City (Texas) | 1,297.94 mi (2,088.84 km) |
| San Marcos to Mitchell (South Dakota) | 1,263.45 mi (2,033.33 km) |
| San Marcos to Mitchellville (Maryland) | 2,271.48 mi (3,655.59 km) |
| San Marcos to Moberly (Missouri) | 1,439.35 mi (2,316.40 km) |
| San Marcos to Mobile (Alabama) | 1,707.36 mi (2,747.72 km) |
| San Marcos to Modesto (California) | 378.45 mi (609.05 km) |
| San Marcos to Mokena (Illinois) | 1,700.94 mi (2,737.39 km) |
| San Marcos to Moline (Illinois) | 1,567.77 mi (2,523.07 km) |
| San Marcos to Moncks Corner (South Carolina) | 2,138.14 mi (3,441.01 km) |
| San Marcos to Monfort Heights (Ohio) | 1,853.55 mi (2,983.00 km) |
| San Marcos to Monmouth (Oregon) | 871.66 mi (1,402.80 km) |
| San Marcos to Monroe (Georgia) | 1,920.46 mi (3,090.68 km) |
| San Marcos to Monroe (Louisiana) | 1,454.27 mi (2,340.42 km) |
| San Marcos to Monroe (Michigan) | 1,933.94 mi (3,112.38 km) |
| San Marcos to Monroe (North Carolina) | 2,087.87 mi (3,360.10 km) |
