| Round Rock to Camarillo (California) | 1,270.26 mi (2,044.28 km) |
| Round Rock to Camas (Washington) | 1,690.87 mi (2,721.20 km) |
| Round Rock to Cambridge (Maryland) | 1,343.47 mi (2,162.11 km) |
| Round Rock to Cambridge (Massachusetts) | 1,677.00 mi (2,698.86 km) |
| Round Rock to Camden (Arkansas) | 351.67 mi (565.95 km) |
| Round Rock to Camden (New Jersey) | 1,423.78 mi (2,291.35 km) |
| Round Rock to Cameron Park (California) | 1,435.68 mi (2,310.51 km) |
| Round Rock to Camp Pendleton South (California) | 1,170.69 mi (1,884.05 km) |
| Round Rock to Camp Springs (Maryland) | 1,306.14 mi (2,102.03 km) |
| Round Rock to Camp Verde (Arizona) | 871.52 mi (1,402.57 km) |
| Round Rock to Campbell (California) | 1,464.06 mi (2,356.18 km) |
| Round Rock to Campbellsville (Kentucky) | 847.41 mi (1,363.77 km) |
| Round Rock to Campton Hills (Illinois) | 941.27 mi (1,514.82 km) |
| Round Rock to Canby (Oregon) | 1,690.55 mi (2,720.68 km) |
| Round Rock to Candelaria (Puerto Rico) | 2,138.14 mi (3,441.01 km) |
