| Round Rock to Conyers (Georgia) | 828.13 mi (1,332.75 km) |
| Round Rock to Cookeville (Tennessee) | 800.95 mi (1,289.01 km) |
| Round Rock to Coolidge (Arizona) | 830.73 mi (1,336.92 km) |
| Round Rock to Coon Rapids (Minnesota) | 1,039.20 mi (1,672.43 km) |
| Round Rock to Cooper City (Florida) | 1,100.35 mi (1,770.85 km) |
| Round Rock to Coos Bay (Oregon) | 1,703.53 mi (2,741.56 km) |
| Round Rock to Copiague (New York) | 1,526.03 mi (2,455.91 km) |
| Round Rock to Coppell (Texas) | 172.97 mi (278.36 km) |
| Round Rock to Copperas Cove (Texas) | 43.52 mi (70.04 km) |
| Round Rock to Coral Gables (Florida) | 1,109.65 mi (1,785.81 km) |
| Round Rock to Coral Springs (Florida) | 1,096.65 mi (1,764.89 km) |
| Round Rock to Coral Terrace (Florida) | 1,106.64 mi (1,780.96 km) |
| Round Rock to Coralville (Iowa) | 842.35 mi (1,355.64 km) |
| Round Rock to Coram (New York) | 1,549.96 mi (2,494.42 km) |
| Round Rock to Corcoran (California) | 1,318.12 mi (2,121.32 km) |
