| San Marcos to Cullman (Alabama) | 1,739.60 mi (2,799.61 km) |
| San Marcos to Culpeper (Virginia) | 2,209.07 mi (3,555.15 km) |
| San Marcos to Culver City (California) | 92.59 mi (149.01 km) |
| San Marcos to Cumberland (Maryland) | 2,166.36 mi (3,486.42 km) |
| San Marcos to Cupertino (California) | 398.76 mi (641.74 km) |
| San Marcos to Cutler Bay (Florida) | 2,266.81 mi (3,648.07 km) |
| San Marcos to Cutlerville (Michigan) | 1,828.60 mi (2,942.84 km) |
| San Marcos to Cuyahoga Falls (Ohio) | 2,024.74 mi (3,258.51 km) |
| San Marcos to Cypress (California) | 68.57 mi (110.36 km) |
| San Marcos to Cypress Gardens (Florida) | 2,130.50 mi (3,428.72 km) |
| San Marcos to Cypress Lake (Florida) | 2,152.12 mi (3,463.50 km) |
| San Marcos to D'Iberville (Mississippi) | 1,665.33 mi (2,680.08 km) |
| San Marcos to Dakota Ridge (Colorado) | 804.65 mi (1,294.96 km) |
| San Marcos to Dale City (Virginia) | 2,243.81 mi (3,611.06 km) |
| San Marcos to Dallas (Georgia) | 1,855.39 mi (2,985.96 km) |
