| Round Rock to Clarksdale (Mississippi) | 485.22 mi (780.89 km) |
| Round Rock to Clarkston (Georgia) | 816.54 mi (1,314.09 km) |
| Round Rock to Clarksville (Indiana) | 864.62 mi (1,391.47 km) |
| Round Rock to Clarksville (Tennessee) | 725.66 mi (1,167.84 km) |
| Round Rock to Clawson (Michigan) | 1,153.38 mi (1,856.19 km) |
| Round Rock to Clay (Alabama) | 682.57 mi (1,098.50 km) |
| Round Rock to Clayton (California) | 1,472.46 mi (2,369.69 km) |
| Round Rock to Clayton (Missouri) | 698.44 mi (1,124.02 km) |
| Round Rock to Clayton (North Carolina) | 1,165.09 mi (1,875.03 km) |
| Round Rock to Clayton (Ohio) | 989.69 mi (1,592.76 km) |
| Round Rock to Clearfield (Utah) | 1,084.15 mi (1,744.77 km) |
| Round Rock to Clearlake (California) | 1,526.33 mi (2,456.39 km) |
| Round Rock to Clearwater (Florida) | 914.67 mi (1,472.01 km) |
| Round Rock to Cleburne (Texas) | 127.28 mi (204.83 km) |
| Round Rock to Clemmons (North Carolina) | 1,066.15 mi (1,715.80 km) |
