| Difficult Run to Corato | 4,696.93 mi (7,558.98 km) |
| Difficult Run to Corbetta | 4,221.88 mi (6,794.47 km) |
| Difficult Run to Corciano | 4,445.53 mi (7,154.38 km) |
| Difficult Run to Cordenons | 4,365.43 mi (7,025.48 km) |
| Difficult Run to Cori | 4,525.74 mi (7,283.48 km) |
| Difficult Run to Coriano | 4,430.26 mi (7,129.81 km) |
| Difficult Run to Corigliano Calabro | 4,761.00 mi (7,662.08 km) |
| Difficult Run to Corleone | 4,683.43 mi (7,537.25 km) |
| Difficult Run to Cormano | 4,229.96 mi (6,807.46 km) |
| Difficult Run to Cornaredo | 4,225.83 mi (6,800.82 km) |
| Difficult Run to Cornate d'Adda | 4,239.60 mi (6,822.97 km) |
| Difficult Run to Cornedo Vicentino | 4,320.86 mi (6,953.74 km) |
| Difficult Run to Correggio | 4,324.78 mi (6,960.05 km) |
| Difficult Run to Corridonia | 4,494.90 mi (7,233.85 km) |
| Difficult Run to Corsico | 4,231.55 mi (6,810.02 km) |
