| San Marcos to Central Point (Oregon) | 710.84 mi (1,143.98 km) |
| San Marcos to Centralia (Illinois) | 1,608.11 mi (2,588.01 km) |
| San Marcos to Centralia (Washington) | 987.02 mi (1,588.45 km) |
| San Marcos to Centreville (Virginia) | 2,238.22 mi (3,602.07 km) |
| San Marcos to Ceres (California) | 374.77 mi (603.13 km) |
| San Marcos to Cerritos (California) | 72.24 mi (116.26 km) |
| San Marcos to Chalco (Nebraska) | 1,280.51 mi (2,060.78 km) |
| San Marcos to Chalmette (Louisiana) | 1,612.73 mi (2,595.43 km) |
| San Marcos to Chambersburg (Pennsylvania) | 2,224.79 mi (3,580.45 km) |
| San Marcos to Chamblee (Georgia) | 1,886.42 mi (3,035.90 km) |
| San Marcos to Champaign (Illinois) | 1,665.14 mi (2,679.79 km) |
| San Marcos to Champlin (Minnesota) | 1,512.66 mi (2,434.39 km) |
| San Marcos to Chandler (Arizona) | 307.85 mi (495.43 km) |
| San Marcos to Chanhassen (Minnesota) | 1,495.88 mi (2,407.39 km) |
| San Marcos to Channahon (Illinois) | 1,680.10 mi (2,703.86 km) |
