| Harwich to Cocentaina | 914.97 mi (1,472.49 km) |
| Harwich to Coin | 1,095.07 mi (1,762.34 km) |
| Harwich to Colindres | 629.00 mi (1,012.28 km) |
| Harwich to Collado-Villalba | 819.86 mi (1,319.44 km) |
| Harwich to Colmenar Viejo | 814.72 mi (1,311.17 km) |
| Harwich to Colmenarejo | 824.80 mi (1,327.39 km) |
| Harwich to Conil de la Frontera | 1,140.84 mi (1,836.01 km) |
| Harwich to Consuegra | 892.72 mi (1,436.70 km) |
| Harwich to Corbera de Llobregat | 727.34 mi (1,170.54 km) |
| Harwich to Cordoba | 1,013.92 mi (1,631.75 km) |
| Harwich to Coria del Rio | 1,073.00 mi (1,726.82 km) |
| Harwich to Crevillente | 950.87 mi (1,530.27 km) |
| Harwich to Cuarte de Huerva | 722.50 mi (1,162.75 km) |
| Harwich to Cubellas | 741.21 mi (1,192.86 km) |
| Harwich to Cuellar | 773.78 mi (1,245.28 km) |
