| Round Rock to Clemson (South Carolina) | 909.83 mi (1,464.23 km) |
| Round Rock to Clermont (Florida) | 967.50 mi (1,557.04 km) |
| Round Rock to Cleveland (Mississippi) | 462.52 mi (744.35 km) |
| Round Rock to Cleveland (Ohio) | 1,167.25 mi (1,878.50 km) |
| Round Rock to Cleveland (Tennessee) | 808.37 mi (1,300.95 km) |
| Round Rock to Cleveland Heights (Ohio) | 1,173.58 mi (1,888.70 km) |
| Round Rock to Cliffside Park (New Jersey) | 1,500.39 mi (2,414.64 km) |
| Round Rock to Clifton (Colorado) | 849.74 mi (1,367.52 km) |
| Round Rock to Clifton (New Jersey) | 1,493.12 mi (2,402.94 km) |
| Round Rock to Clinton (Iowa) | 883.84 mi (1,422.41 km) |
| Round Rock to Clinton (Maryland) | 1,305.55 mi (2,101.08 km) |
| Round Rock to Clinton (Mississippi) | 449.70 mi (723.72 km) |
| Round Rock to Clinton (Utah) | 1,087.41 mi (1,750.02 km) |
| Round Rock to Clive (Iowa) | 795.69 mi (1,280.54 km) |
| Round Rock to Cloquet (Minnesota) | 1,152.61 mi (1,854.94 km) |
