| Castro Valley to Cortona | 6,143.95 mi (9,887.73 km) |
| Castro Valley to Cosenza | 6,494.87 mi (10,452.48 km) |
| Castro Valley to Cossato | 5,905.12 mi (9,503.37 km) |
| Castro Valley to Costa Volpino | 5,946.16 mi (9,569.42 km) |
| Castro Valley to Creazzo | 6,001.70 mi (9,658.80 km) |
| Castro Valley to Crema | 5,960.19 mi (9,592.00 km) |
| Castro Valley to Cremona | 5,983.25 mi (9,629.12 km) |
| Castro Valley to Crevalcore | 6,038.48 mi (9,717.99 km) |
| Castro Valley to Crispiano | 6,445.46 mi (10,372.96 km) |
| Castro Valley to Crosia | 6,493.65 mi (10,450.52 km) |
| Castro Valley to Crotone | 6,531.91 mi (10,512.09 km) |
| Castro Valley to Cuneo | 5,951.68 mi (9,578.30 km) |
| Castro Valley to Cuorgne | 5,899.60 mi (9,494.48 km) |
| Castro Valley to Cusano Milanino | 5,935.61 mi (9,552.44 km) |
| Castro Valley to Cutro | 6,531.15 mi (10,510.87 km) |
