| San Marcos to Cibolo (Texas) | 1,144.08 mi (1,841.22 km) |
| San Marcos to Cicero (Illinois) | 1,710.94 mi (2,753.50 km) |
| San Marcos to Cimarron Hills (Colorado) | 800.63 mi (1,288.50 km) |
| San Marcos to Cincinnati (Ohio) | 1,858.85 mi (2,991.52 km) |
| San Marcos to Cinco Ranch (Texas) | 1,281.60 mi (2,062.54 km) |
| San Marcos to Circleville (Ohio) | 1,944.19 mi (3,128.87 km) |
| San Marcos to Citrus (California) | 79.28 mi (127.59 km) |
| San Marcos to Citrus Heights (California) | 447.71 mi (720.52 km) |
| San Marcos to Citrus Park (Florida) | 2,078.24 mi (3,344.61 km) |
| San Marcos to Claiborne (Louisiana) | 1,447.12 mi (2,328.91 km) |
| San Marcos to Claremont (California) | 75.21 mi (121.03 km) |
| San Marcos to Claremont (New Hampshire) | 2,500.82 mi (4,024.68 km) |
| San Marcos to Claremore (Oklahoma) | 1,241.45 mi (1,997.93 km) |
| San Marcos to Clarksburg (Maryland) | 2,246.53 mi (3,615.44 km) |
| San Marcos to Clarksburg (West Virginia) | 2,082.92 mi (3,352.14 km) |
