| Helena to Cocentaina | 5,187.01 mi (8,347.68 km) |
| Helena to Coin | 5,135.17 mi (8,264.25 km) |
| Helena to Colindres | 4,844.44 mi (7,796.37 km) |
| Helena to Collado-Villalba | 4,962.77 mi (7,986.80 km) |
| Helena to Colmenar Viejo | 4,970.22 mi (7,998.79 km) |
| Helena to Colmenarejo | 4,966.09 mi (7,992.16 km) |
| Helena to Conil de la Frontera | 5,104.59 mi (8,215.04 km) |
| Helena to Consuegra | 5,036.30 mi (8,105.14 km) |
| Helena to Corbera de Llobregat | 5,130.20 mi (8,256.26 km) |
| Helena to Cordoba | 5,072.61 mi (8,163.57 km) |
| Helena to Coria del Rio | 5,054.95 mi (8,135.16 km) |
| Helena to Crevillente | 5,199.54 mi (8,367.85 km) |
| Helena to Cuarte de Huerva | 5,024.02 mi (8,085.38 km) |
| Helena to Cubellas | 5,132.29 mi (8,259.62 km) |
| Helena to Cuellar | 4,913.39 mi (7,907.34 km) |
