| Castro Valley to Cognac | 5,634.01 mi (9,067.07 km) |
| Castro Valley to Cogolin | 5,981.99 mi (9,627.08 km) |
| Castro Valley to Colmar | 5,744.10 mi (9,244.24 km) |
| Castro Valley to Colombes | 5,550.01 mi (8,931.88 km) |
| Castro Valley to Colomiers | 5,795.54 mi (9,327.02 km) |
| Castro Valley to Combs-la-Ville | 5,572.42 mi (8,967.94 km) |
| Castro Valley to Comines | 5,476.99 mi (8,814.36 km) |
| Castro Valley to Compiegne | 5,541.57 mi (8,918.30 km) |
| Castro Valley to Concarneau | 5,407.72 mi (8,702.88 km) |
| Castro Valley to Conde-sur-l'Escaut | 5,510.02 mi (8,867.52 km) |
| Castro Valley to Conflans-Sainte-Honorine | 5,541.47 mi (8,918.13 km) |
| Castro Valley to Corbas | 5,801.67 mi (9,336.88 km) |
| Castro Valley to Corbeil-Essonnes | 5,572.98 mi (8,968.84 km) |
| Castro Valley to Cormeilles-en-Parisis | 5,545.88 mi (8,925.23 km) |
| Castro Valley to Cosne sur Loire | 5,649.09 mi (9,091.34 km) |
