| Harrow to Carmona | 1,008.87 mi (1,623.63 km) |
| Harrow to Cartagena | 966.67 mi (1,555.70 km) |
| Harrow to Cartama | 1,048.82 mi (1,687.92 km) |
| Harrow to Cartaya | 1,042.39 mi (1,677.57 km) |
| Harrow to Caspe | 715.29 mi (1,151.15 km) |
| Harrow to Cassa de la Selva | 686.77 mi (1,105.26 km) |
| Harrow to Castalla | 897.44 mi (1,444.30 km) |
| Harrow to Castellbisbal | 706.94 mi (1,137.71 km) |
| Harrow to Castelldefels | 720.35 mi (1,159.30 km) |
| Harrow to Castello de Ampurias | 664.05 mi (1,068.68 km) |
| Harrow to Castellon de la Plana | 801.66 mi (1,290.14 km) |
| Harrow to Castilleja de la Cuesta | 1,019.84 mi (1,641.28 km) |
| Harrow to Catarroja | 841.62 mi (1,354.45 km) |
| Harrow to Catral | 927.79 mi (1,493.13 km) |
| Harrow to Caudete | 890.41 mi (1,432.97 km) |
