| Round Rock to Cocentaina | 5,285.73 mi (8,506.56 km) |
| Round Rock to Coin | 5,143.52 mi (8,277.69 km) |
| Round Rock to Colindres | 4,999.87 mi (8,046.51 km) |
| Round Rock to Collado-Villalba | 5,057.35 mi (8,139.03 km) |
| Round Rock to Colmenar Viejo | 5,067.98 mi (8,156.13 km) |
| Round Rock to Colmenarejo | 5,059.15 mi (8,141.92 km) |
| Round Rock to Conil de la Frontera | 5,089.52 mi (8,190.79 km) |
| Round Rock to Consuegra | 5,112.35 mi (8,227.53 km) |
| Round Rock to Corbera de Llobregat | 5,306.40 mi (8,539.82 km) |
| Round Rock to Cordoba | 5,104.40 mi (8,214.74 km) |
| Round Rock to Coria del Rio | 5,060.31 mi (8,143.78 km) |
| Round Rock to Crevillente | 5,284.56 mi (8,504.68 km) |
| Round Rock to Cuarte de Huerva | 5,171.32 mi (8,322.43 km) |
| Round Rock to Cubellas | 5,301.70 mi (8,532.25 km) |
| Round Rock to Cuellar | 5,019.86 mi (8,078.68 km) |
