| Reston to Cocentaina | 4,003.03 mi (6,442.26 km) |
| Reston to Coin | 3,855.89 mi (6,205.46 km) |
| Reston to Colindres | 3,726.90 mi (5,997.87 km) |
| Reston to Collado-Villalba | 3,775.79 mi (6,076.54 km) |
| Reston to Colmenar Viejo | 3,786.68 mi (6,094.07 km) |
| Reston to Colmenarejo | 3,777.42 mi (6,079.16 km) |
| Reston to Conil de la Frontera | 3,801.52 mi (6,117.96 km) |
| Reston to Consuegra | 3,828.66 mi (6,161.63 km) |
| Reston to Corbera de Llobregat | 4,033.25 mi (6,490.89 km) |
| Reston to Cordoba | 3,817.77 mi (6,144.10 km) |
| Reston to Coria del Rio | 3,772.75 mi (6,071.65 km) |
| Reston to Crevillente | 4,000.66 mi (6,438.44 km) |
| Reston to Cuarte de Huerva | 3,895.27 mi (6,268.83 km) |
| Reston to Cubellas | 4,027.55 mi (6,481.72 km) |
| Reston to Cuellar | 3,739.90 mi (6,018.79 km) |
