| San Marcos to Carlsbad (California) | 6.35 mi (10.22 km) |
| San Marcos to Carlsbad (New Mexico) | 752.76 mi (1,211.45 km) |
| San Marcos to Carmel (Indiana) | 1,775.77 mi (2,857.82 km) |
| San Marcos to Carmichael (California) | 445.14 mi (716.39 km) |
| San Marcos to Carney (Maryland) | 2,285.77 mi (3,678.60 km) |
| San Marcos to Carnot-Moon (Pennsylvania) | 2,090.23 mi (3,363.91 km) |
| San Marcos to Carol Stream (Illinois) | 1,693.19 mi (2,724.92 km) |
| San Marcos to Carolina (Puerto Rico) | 3,309.14 mi (5,325.54 km) |
| San Marcos to Carolina Forest (South Carolina) | 2,193.31 mi (3,529.79 km) |
| San Marcos to Carpentersville (Illinois) | 1,688.08 mi (2,716.70 km) |
| San Marcos to Carpinteria (California) | 160.05 mi (257.58 km) |
| San Marcos to Carrboro (North Carolina) | 2,162.81 mi (3,480.70 km) |
| San Marcos to Carroll (Iowa) | 1,362.73 mi (2,193.10 km) |
| San Marcos to Carrollton (Georgia) | 1,844.72 mi (2,968.79 km) |
| San Marcos to Carrollton (Texas) | 1,172.21 mi (1,886.49 km) |
