| Round Rock to Cadillac (Michigan) | 1,159.49 mi (1,866.01 km) |
| Round Rock to Caguas (Puerto Rico) | 2,154.18 mi (3,466.82 km) |
| Round Rock to Cahokia (Illinois) | 699.34 mi (1,125.48 km) |
| Round Rock to Calabasas (California) | 1,249.01 mi (2,010.09 km) |
| Round Rock to Caldwell (Idaho) | 1,378.76 mi (2,218.90 km) |
| Round Rock to Caledonia (Wisconsin) | 1,004.96 mi (1,617.33 km) |
| Round Rock to Calera (Alabama) | 665.31 mi (1,070.72 km) |
| Round Rock to Calexico (California) | 1,058.47 mi (1,703.44 km) |
| Round Rock to Calhoun (Georgia) | 789.73 mi (1,270.94 km) |
| Round Rock to California (Maryland) | 1,316.65 mi (2,118.95 km) |
| Round Rock to California City (California) | 1,213.48 mi (1,952.91 km) |
| Round Rock to Callaway (Florida) | 722.20 mi (1,162.27 km) |
| Round Rock to Calumet City (Illinois) | 950.21 mi (1,529.22 km) |
| Round Rock to Calverton (Maryland) | 1,310.66 mi (2,109.30 km) |
| Round Rock to Camano (Washington) | 1,786.54 mi (2,875.17 km) |
