| San Marcos to Somersworth (New Hampshire) | 2,573.70 mi (4,141.98 km) |
| San Marcos to Somerton (Arizona) | 148.29 mi (238.65 km) |
| San Marcos to Somerville (Massachusetts) | 2,563.44 mi (4,125.46 km) |
| San Marcos to Somerville (New Jersey) | 2,384.68 mi (3,837.77 km) |
| San Marcos to Sonoma (California) | 463.27 mi (745.57 km) |
| San Marcos to Soquel (California) | 379.52 mi (610.78 km) |
| San Marcos to South Bend (Indiana) | 1,784.52 mi (2,871.91 km) |
| San Marcos to South Bradenton (Florida) | 2,090.79 mi (3,364.81 km) |
| San Marcos to South Burlington (Vermont) | 2,459.61 mi (3,958.36 km) |
| San Marcos to South Charleston (West Virginia) | 2,008.25 mi (3,231.97 km) |
| San Marcos to South Daytona (Florida) | 2,145.62 mi (3,453.03 km) |
| San Marcos to South El Monte (California) | 80.76 mi (129.96 km) |
| San Marcos to South Elgin (Illinois) | 1,685.00 mi (2,711.74 km) |
| San Marcos to South Euclid (Ohio) | 2,026.53 mi (3,261.39 km) |
| San Marcos to South Farmingdale (New York) | 2,445.27 mi (3,935.27 km) |
