| Round Rock to Cloverleaf (Texas) | 157.37 mi (253.26 km) |
| Round Rock to Cloverly (Maryland) | 1,309.28 mi (2,107.09 km) |
| Round Rock to Clovis (California) | 1,335.09 mi (2,148.61 km) |
| Round Rock to Clovis (New Mexico) | 420.37 mi (676.51 km) |
| Round Rock to Clute (Texas) | 170.99 mi (275.18 km) |
| Round Rock to Coachella (California) | 1,101.73 mi (1,773.07 km) |
| Round Rock to Coalinga (California) | 1,360.74 mi (2,189.89 km) |
| Round Rock to Coamo (Puerto Rico) | 2,140.87 mi (3,445.40 km) |
| Round Rock to Coatesville (Pennsylvania) | 1,389.66 mi (2,236.44 km) |
| Round Rock to Cockeysville (Maryland) | 1,336.97 mi (2,151.65 km) |
| Round Rock to Cocoa (Florida) | 1,026.30 mi (1,651.66 km) |
| Round Rock to Cocoa Beach (Florida) | 1,035.35 mi (1,666.23 km) |
| Round Rock to Coconut Creek (Florida) | 1,100.79 mi (1,771.55 km) |
| Round Rock to Coeur d'Alene (Idaho) | 1,559.68 mi (2,510.06 km) |
| Round Rock to Cohoes (New York) | 1,565.99 mi (2,520.21 km) |
