| Round Rock to Cold Springs (Nevada) | 1,405.88 mi (2,262.54 km) |
| Round Rock to Coldwater (Michigan) | 1,056.27 mi (1,699.90 km) |
| Round Rock to Colesville (Maryland) | 1,308.40 mi (2,105.66 km) |
| Round Rock to College (Alaska) | 3,180.62 mi (5,118.71 km) |
| Round Rock to College Park (Georgia) | 801.41 mi (1,289.74 km) |
| Round Rock to College Park (Maryland) | 1,309.93 mi (2,108.14 km) |
| Round Rock to College Station (Texas) | 81.51 mi (131.18 km) |
| Round Rock to Collegedale (Tennessee) | 795.89 mi (1,280.86 km) |
| Round Rock to Colleyville (Texas) | 166.14 mi (267.38 km) |
| Round Rock to Collierville (Tennessee) | 557.91 mi (897.86 km) |
| Round Rock to Collinsville (Illinois) | 711.27 mi (1,144.67 km) |
| Round Rock to Colonia (New Jersey) | 1,478.76 mi (2,379.84 km) |
| Round Rock to Colonial Heights (Virginia) | 1,248.88 mi (2,009.88 km) |
| Round Rock to Colonial Park (Pennsylvania) | 1,349.70 mi (2,172.13 km) |
| Round Rock to Colorado Springs (Colorado) | 702.72 mi (1,130.92 km) |
