| Difficult Run to Chivasso | 4,186.18 mi (6,737.01 km) |
| Difficult Run to Ciampino | 4,506.38 mi (7,252.32 km) |
| Difficult Run to Cicciano | 4,621.91 mi (7,438.25 km) |
| Difficult Run to Cingoli | 4,477.82 mi (7,206.35 km) |
| Difficult Run to Cinisello Balsamo | 4,232.10 mi (6,810.91 km) |
| Difficult Run to Cinisi | 4,661.20 mi (7,501.48 km) |
| Difficult Run to Cirie | 4,172.35 mi (6,714.75 km) |
| Difficult Run to Ciro Marina | 4,796.94 mi (7,719.92 km) |
| Difficult Run to Cislago | 4,218.19 mi (6,788.52 km) |
| Difficult Run to Cisterna di Latina | 4,523.94 mi (7,280.57 km) |
| Difficult Run to Cisternino | 4,757.80 mi (7,656.94 km) |
| Difficult Run to Citta di Castello | 4,432.42 mi (7,133.30 km) |
| Difficult Run to Citta Sant'Angelo | 4,544.23 mi (7,313.23 km) |
| Difficult Run to Cittadella | 4,338.08 mi (6,981.47 km) |
| Difficult Run to Cittanova | 4,789.65 mi (7,708.20 km) |
