| San Marcos to South Plainfield (New Jersey) | 2,394.85 mi (3,854.13 km) |
| San Marcos to South Portland (Maine) | 2,603.56 mi (4,190.02 km) |
| San Marcos to South Riding (Virginia) | 2,234.03 mi (3,595.32 km) |
| San Marcos to South River (New Jersey) | 2,397.04 mi (3,857.66 km) |
| San Marcos to South Salt Lake (Utah) | 598.49 mi (963.17 km) |
| San Marcos to South San Francisco (California) | 429.68 mi (691.51 km) |
| San Marcos to South San Jose Hills (California) | 73.76 mi (118.70 km) |
| San Marcos to South Sioux City (Nebraska) | 1,298.80 mi (2,090.21 km) |
| San Marcos to South St. Paul (Minnesota) | 1,520.08 mi (2,446.33 km) |
| San Marcos to South Valley (New Mexico) | 613.99 mi (988.12 km) |
| San Marcos to South Venice (Florida) | 2,110.14 mi (3,395.94 km) |
| San Marcos to South Whittier (California) | 74.03 mi (119.14 km) |
| San Marcos to South Yarmouth (Massachusetts) | 2,611.31 mi (4,202.50 km) |
| San Marcos to Southaven (Mississippi) | 1,557.26 mi (2,506.17 km) |
| San Marcos to Southchase (Florida) | 2,139.49 mi (3,443.18 km) |
