| San Marcos to Conyers (Georgia) | 1,905.82 mi (3,067.13 km) |
| San Marcos to Cookeville (Tennessee) | 1,803.90 mi (2,903.09 km) |
| San Marcos to Coolidge (Arizona) | 327.45 mi (526.98 km) |
| San Marcos to Coon Rapids (Minnesota) | 1,516.38 mi (2,440.39 km) |
| San Marcos to Cooper City (Florida) | 2,257.63 mi (3,633.31 km) |
| San Marcos to Coos Bay (Oregon) | 804.01 mi (1,293.93 km) |
| San Marcos to Copiague (New York) | 2,448.26 mi (3,940.10 km) |
| San Marcos to Coppell (Texas) | 1,167.18 mi (1,878.40 km) |
| San Marcos to Copperas Cove (Texas) | 1,133.93 mi (1,824.88 km) |
| San Marcos to Coral Gables (Florida) | 2,267.22 mi (3,648.73 km) |
| San Marcos to Coral Springs (Florida) | 2,253.60 mi (3,626.81 km) |
| San Marcos to Coral Terrace (Florida) | 2,264.19 mi (3,643.86 km) |
| San Marcos to Coralville (Iowa) | 1,515.88 mi (2,439.57 km) |
| San Marcos to Coram (New York) | 2,467.95 mi (3,971.79 km) |
| San Marcos to Corcoran (California) | 244.81 mi (393.99 km) |
