| Round Rock to Cullman (Alabama) | 679.77 mi (1,093.98 km) |
| Round Rock to Culpeper (Virginia) | 1,243.45 mi (2,001.13 km) |
| Round Rock to Culver City (California) | 1,232.62 mi (1,983.72 km) |
| Round Rock to Cumberland (Maryland) | 1,237.12 mi (1,990.95 km) |
| Round Rock to Cupertino (California) | 1,469.56 mi (2,365.03 km) |
| Round Rock to Cutler Bay (Florida) | 1,109.19 mi (1,785.06 km) |
| Round Rock to Cutlerville (Michigan) | 1,077.09 mi (1,733.40 km) |
| Round Rock to Cuyahoga Falls (Ohio) | 1,161.78 mi (1,869.71 km) |
| Round Rock to Cypress (California) | 1,210.95 mi (1,948.84 km) |
| Round Rock to Cypress Gardens (Florida) | 977.86 mi (1,573.72 km) |
| Round Rock to Cypress Lake (Florida) | 994.78 mi (1,600.94 km) |
| Round Rock to D'Iberville (Mississippi) | 521.58 mi (839.40 km) |
| Round Rock to Dakota Ridge (Colorado) | 756.36 mi (1,217.24 km) |
| Round Rock to Dale City (Virginia) | 1,280.84 mi (2,061.31 km) |
| Round Rock to Dallas (Georgia) | 784.57 mi (1,262.64 km) |
