| Round Rock to Carlsbad (California) | 1,163.89 mi (1,873.09 km) |
| Round Rock to Carlsbad (New Mexico) | 408.44 mi (657.32 km) |
| Round Rock to Carmel (Indiana) | 919.13 mi (1,479.19 km) |
| Round Rock to Carmichael (California) | 1,452.51 mi (2,337.58 km) |
| Round Rock to Carney (Maryland) | 1,340.39 mi (2,157.15 km) |
| Round Rock to Carnot-Moon (Pennsylvania) | 1,196.00 mi (1,924.77 km) |
| Round Rock to Carol Stream (Illinois) | 948.24 mi (1,526.05 km) |
| Round Rock to Carolina (Puerto Rico) | 2,151.76 mi (3,462.93 km) |
| Round Rock to Carolina Forest (South Carolina) | 1,117.86 mi (1,799.03 km) |
| Round Rock to Carpentersville (Illinois) | 954.76 mi (1,536.54 km) |
| Round Rock to Carpinteria (California) | 1,298.69 mi (2,090.04 km) |
| Round Rock to Carrboro (North Carolina) | 1,134.42 mi (1,825.67 km) |
| Round Rock to Carroll (Iowa) | 812.50 mi (1,307.59 km) |
| Round Rock to Carrollton (Georgia) | 765.76 mi (1,232.37 km) |
| Round Rock to Carrollton (Texas) | 175.93 mi (283.14 km) |
