| San Marcos to Crawfordsville (Indiana) | 1,736.76 mi (2,795.04 km) |
| San Marcos to Crest Hill (Illinois) | 1,689.53 mi (2,719.03 km) |
| San Marcos to Crestview (Florida) | 1,795.12 mi (2,888.96 km) |
| San Marcos to Crestwood (Illinois) | 1,709.38 mi (2,750.98 km) |
| San Marcos to Crestwood (Missouri) | 1,540.79 mi (2,479.66 km) |
| San Marcos to Creve Coeur (Missouri) | 1,538.07 mi (2,475.28 km) |
| San Marcos to Crofton (Maryland) | 2,278.46 mi (3,666.83 km) |
| San Marcos to Crossville (Tennessee) | 1,831.47 mi (2,947.46 km) |
| San Marcos to Crowley (Louisiana) | 1,468.58 mi (2,363.45 km) |
| San Marcos to Crowley (Texas) | 1,149.05 mi (1,849.22 km) |
| San Marcos to Crown Point (Indiana) | 1,726.66 mi (2,778.79 km) |
| San Marcos to Crystal (Minnesota) | 1,510.15 mi (2,430.35 km) |
| San Marcos to Crystal Lake (Illinois) | 1,687.42 mi (2,715.64 km) |
| San Marcos to Cudahy (California) | 81.53 mi (131.21 km) |
| San Marcos to Cudahy (Wisconsin) | 1,721.74 mi (2,770.87 km) |
