| Grayslake to Cocentaina | 4,389.43 mi (7,064.10 km) |
| Grayslake to Coin | 4,274.47 mi (6,879.10 km) |
| Grayslake to Colindres | 4,083.93 mi (6,572.46 km) |
| Grayslake to Collado-Villalba | 4,159.29 mi (6,693.73 km) |
| Grayslake to Colmenar Viejo | 4,169.11 mi (6,709.54 km) |
| Grayslake to Colmenarejo | 4,161.57 mi (6,697.40 km) |
| Grayslake to Conil de la Frontera | 4,227.95 mi (6,804.23 km) |
| Grayslake to Consuegra | 4,220.66 mi (6,792.49 km) |
| Grayslake to Corbera de Llobregat | 4,388.73 mi (7,062.98 km) |
| Grayslake to Cordoba | 4,226.83 mi (6,802.43 km) |
| Grayslake to Coria del Rio | 4,191.11 mi (6,744.93 km) |
| Grayslake to Crevillente | 4,392.40 mi (7,068.88 km) |
| Grayslake to Cuarte de Huerva | 4,259.69 mi (6,855.30 km) |
| Grayslake to Cubellas | 4,385.74 mi (7,058.17 km) |
| Grayslake to Cuellar | 4,117.79 mi (6,626.94 km) |
