| Boulder City to Cocentaina | 5,804.28 mi (9,341.09 km) |
| Boulder City to Coin | 5,720.70 mi (9,206.58 km) |
| Boulder City to Colindres | 5,475.24 mi (8,811.54 km) |
| Boulder City to Collado-Villalba | 5,575.56 mi (8,973.00 km) |
| Boulder City to Colmenar Viejo | 5,584.17 mi (8,986.86 km) |
| Boulder City to Colmenarejo | 5,578.43 mi (8,977.61 km) |
| Boulder City to Conil de la Frontera | 5,681.22 mi (9,143.04 km) |
| Boulder City to Consuegra | 5,643.93 mi (9,083.03 km) |
| Boulder City to Corbera de Llobregat | 5,771.25 mi (9,287.92 km) |
| Boulder City to Cordoba | 5,665.54 mi (9,117.80 km) |
| Boulder City to Coria del Rio | 5,638.24 mi (9,073.88 km) |
| Boulder City to Crevillente | 5,812.45 mi (9,354.24 km) |
| Boulder City to Cuarte de Huerva | 5,654.71 mi (9,100.38 km) |
| Boulder City to Cubellas | 5,771.29 mi (9,287.99 km) |
| Boulder City to Cuellar | 5,529.41 mi (8,898.73 km) |
