| San Marcos to Marrero (Louisiana) | 1,605.26 mi (2,583.41 km) |
| San Marcos to Marshall (Minnesota) | 1,385.11 mi (2,229.12 km) |
| San Marcos to Marshall (Missouri) | 1,395.48 mi (2,245.80 km) |
| San Marcos to Marshall (Texas) | 1,322.98 mi (2,129.14 km) |
| San Marcos to Marshalltown (Iowa) | 1,457.32 mi (2,345.34 km) |
| San Marcos to Marshfield (Wisconsin) | 1,644.96 mi (2,647.30 km) |
| San Marcos to Martha Lake (Washington) | 1,050.14 mi (1,690.03 km) |
| San Marcos to Martin (Tennessee) | 1,617.46 mi (2,603.06 km) |
| San Marcos to Martinez (California) | 435.81 mi (701.36 km) |
| San Marcos to Martinez (Georgia) | 2,015.31 mi (3,243.33 km) |
| San Marcos to Martinsburg (West Virginia) | 2,208.10 mi (3,553.60 km) |
| San Marcos to Martinsville (Indiana) | 1,757.27 mi (2,828.05 km) |
| San Marcos to Martinsville (New Jersey) | 2,386.41 mi (3,840.55 km) |
| San Marcos to Martinsville (Virginia) | 2,114.90 mi (3,403.61 km) |
| San Marcos to Maryland City (Maryland) | 2,271.50 mi (3,655.63 km) |
