| San Marcos to Cadillac (Michigan) | 1,861.75 mi (2,996.20 km) |
| San Marcos to Caguas (Puerto Rico) | 3,311.42 mi (5,329.21 km) |
| San Marcos to Cahokia (Illinois) | 1,551.54 mi (2,496.97 km) |
| San Marcos to Calabasas (California) | 110.40 mi (177.68 km) |
| San Marcos to Caldwell (Idaho) | 726.72 mi (1,169.55 km) |
| San Marcos to Caledonia (Wisconsin) | 1,718.81 mi (2,766.15 km) |
| San Marcos to Calera (Alabama) | 1,754.37 mi (2,823.39 km) |
| San Marcos to Calexico (California) | 102.28 mi (164.61 km) |
| San Marcos to Calhoun (Georgia) | 1,845.11 mi (2,969.41 km) |
| San Marcos to California (Maryland) | 2,291.13 mi (3,687.21 km) |
| San Marcos to California City (California) | 145.34 mi (233.91 km) |
| San Marcos to Callaway (Florida) | 1,864.42 mi (3,000.49 km) |
| San Marcos to Calumet City (Illinois) | 1,718.59 mi (2,765.81 km) |
| San Marcos to Calverton (Maryland) | 2,263.92 mi (3,643.43 km) |
| San Marcos to Camano (Washington) | 1,075.70 mi (1,731.17 km) |
