| San Marcos to Candler-McAfee (Georgia) | 1,889.53 mi (3,040.90 km) |
| San Marcos to Caño Martin Peña (Puerto Rico) | 3,304.18 mi (5,317.56 km) |
| San Marcos to Cañon City (Colorado) | 762.89 mi (1,227.75 km) |
| San Marcos to Canóvanas (Puerto Rico) | 3,314.84 mi (5,334.72 km) |
| San Marcos to Canton (Georgia) | 1,872.49 mi (3,013.48 km) |
| San Marcos to Canton (Illinois) | 1,578.04 mi (2,539.61 km) |
| San Marcos to Canton (Mississippi) | 1,571.22 mi (2,528.64 km) |
| San Marcos to Canton (Ohio) | 2,031.04 mi (3,268.64 km) |
| San Marcos to Canyon (Texas) | 881.66 mi (1,418.90 km) |
| San Marcos to Canyon Lake (California) | 38.58 mi (62.08 km) |
| San Marcos to Canyon Lake (Texas) | 1,134.99 mi (1,826.59 km) |
| San Marcos to Cape Coral (Florida) | 2,144.01 mi (3,450.45 km) |
| San Marcos to Cape Girardeau (Missouri) | 1,579.28 mi (2,541.61 km) |
| San Marcos to Carbondale (Illinois) | 1,598.96 mi (2,573.27 km) |
| San Marcos to Carlisle (Pennsylvania) | 2,248.56 mi (3,618.71 km) |
