| Castro Valley to Collegno | 5,914.38 mi (9,518.27 km) |
| Castro Valley to Cologno al Serio | 5,948.60 mi (9,573.35 km) |
| Castro Valley to Cologno Monzese | 5,939.53 mi (9,558.76 km) |
| Castro Valley to Colorno | 6,004.47 mi (9,663.26 km) |
| Castro Valley to Comacchio | 6,068.45 mi (9,766.23 km) |
| Castro Valley to Comiso | 6,583.80 mi (10,595.60 km) |
| Castro Valley to Como | 5,918.38 mi (9,524.71 km) |
| Castro Valley to Concordia Sagittaria | 6,025.89 mi (9,697.73 km) |
| Castro Valley to Concorezzo | 5,937.80 mi (9,555.97 km) |
| Castro Valley to Conegliano | 6,004.04 mi (9,662.57 km) |
| Castro Valley to Conselice | 6,069.08 mi (9,767.24 km) |
| Castro Valley to Conselve | 6,029.34 mi (9,703.29 km) |
| Castro Valley to Conversano | 6,420.62 mi (10,332.98 km) |
| Castro Valley to Copertino | 6,487.25 mi (10,440.21 km) |
| Castro Valley to Copparo | 6,047.33 mi (9,732.23 km) |
