| Round Rock to Candler-McAfee (Georgia) | 813.49 mi (1,309.19 km) |
| Round Rock to Caño Martin Peña (Puerto Rico) | 2,146.81 mi (3,454.95 km) |
| Round Rock to Cañon City (Colorado) | 695.37 mi (1,119.08 km) |
| Round Rock to Canóvanas (Puerto Rico) | 2,157.46 mi (3,472.10 km) |
| Round Rock to Canton (Georgia) | 809.76 mi (1,303.18 km) |
| Round Rock to Canton (Illinois) | 814.40 mi (1,310.64 km) |
| Round Rock to Canton (Mississippi) | 471.43 mi (758.69 km) |
| Round Rock to Canton (Ohio) | 1,154.87 mi (1,858.58 km) |
| Round Rock to Canyon (Texas) | 395.19 mi (636.00 km) |
| Round Rock to Canyon Lake (California) | 1,165.71 mi (1,876.04 km) |
| Round Rock to Canyon Lake (Texas) | 57.38 mi (92.35 km) |
| Round Rock to Cape Coral (Florida) | 986.76 mi (1,588.04 km) |
| Round Rock to Cape Girardeau (Missouri) | 659.48 mi (1,061.33 km) |
| Round Rock to Carbondale (Illinois) | 692.35 mi (1,114.23 km) |
| Round Rock to Carlisle (Pennsylvania) | 1,327.81 mi (2,136.90 km) |
