| Clay to Chivasso | 4,812.90 mi (7,745.61 km) |
| Clay to Ciampino | 5,133.99 mi (8,262.36 km) |
| Clay to Cicciano | 5,249.48 mi (8,448.23 km) |
| Clay to Cingoli | 5,104.30 mi (8,214.58 km) |
| Clay to Cinisello Balsamo | 4,858.11 mi (7,818.38 km) |
| Clay to Cinisi | 5,289.46 mi (8,512.56 km) |
| Clay to Cirie | 4,799.11 mi (7,723.42 km) |
| Clay to Ciro Marina | 5,424.63 mi (8,730.10 km) |
| Clay to Cislago | 4,844.20 mi (7,795.98 km) |
| Clay to Cisterna di Latina | 5,151.59 mi (8,290.68 km) |
| Clay to Cisternino | 5,384.71 mi (8,665.86 km) |
| Clay to Citta di Castello | 5,059.14 mi (8,141.91 km) |
| Clay to Citta Sant'Angelo | 5,171.05 mi (8,322.00 km) |
| Clay to Cittadella | 4,963.03 mi (7,987.22 km) |
| Clay to Cittanova | 5,417.81 mi (8,719.13 km) |
