| San Marcos to Superior (Colorado) | 814.67 mi (1,311.08 km) |
| San Marcos to Superior (Wisconsin) | 1,615.08 mi (2,599.22 km) |
| San Marcos to Surprise (Arizona) | 274.98 mi (442.53 km) |
| San Marcos to Susanville (California) | 538.04 mi (865.88 km) |
| San Marcos to Sussex (Wisconsin) | 1,707.24 mi (2,747.54 km) |
| San Marcos to Suwanee (Georgia) | 1,898.08 mi (3,054.66 km) |
| San Marcos to Swansea (Illinois) | 1,561.85 mi (2,513.56 km) |
| San Marcos to Sweetwater (Florida) | 2,259.26 mi (3,635.92 km) |
| San Marcos to Sweetwater (Texas) | 973.70 mi (1,567.02 km) |
| San Marcos to Sycamore (Illinois) | 1,666.55 mi (2,682.06 km) |
| San Marcos to Sylacauga (Alabama) | 1,781.55 mi (2,867.13 km) |
| San Marcos to Sylvania (Ohio) | 1,915.62 mi (3,082.90 km) |
| San Marcos to Syosset (New York) | 2,442.19 mi (3,930.32 km) |
| San Marcos to Syracuse (New York) | 2,308.38 mi (3,714.98 km) |
| San Marcos to Syracuse (Utah) | 616.87 mi (992.76 km) |
