| Round Rock to Cibolo (Texas) | 74.19 mi (119.40 km) |
| Round Rock to Cicero (Illinois) | 955.88 mi (1,538.34 km) |
| Round Rock to Cimarron Hills (Colorado) | 700.32 mi (1,127.06 km) |
| Round Rock to Cincinnati (Ohio) | 952.75 mi (1,533.31 km) |
| Round Rock to Cinco Ranch (Texas) | 126.09 mi (202.92 km) |
| Round Rock to Circleville (Ohio) | 1,040.50 mi (1,674.52 km) |
| Round Rock to Citrus (California) | 1,204.50 mi (1,938.46 km) |
| Round Rock to Citrus Heights (California) | 1,451.68 mi (2,336.26 km) |
| Round Rock to Citrus Park (Florida) | 924.83 mi (1,488.37 km) |
| Round Rock to Claiborne (Louisiana) | 350.55 mi (564.15 km) |
| Round Rock to Claremont (California) | 1,194.70 mi (1,922.68 km) |
| Round Rock to Claremont (New Hampshire) | 1,646.30 mi (2,649.47 km) |
| Round Rock to Claremore (Oklahoma) | 417.04 mi (671.16 km) |
| Round Rock to Clarksburg (Maryland) | 1,298.88 mi (2,090.34 km) |
| Round Rock to Clarksburg (West Virginia) | 1,150.95 mi (1,852.27 km) |
