| Clemson to Cortona | 4,845.11 mi (7,797.45 km) |
| Clemson to Cosenza | 5,176.36 mi (8,330.55 km) |
| Clemson to Cossato | 4,604.41 mi (7,410.09 km) |
| Clemson to Costa Volpino | 4,679.30 mi (7,530.61 km) |
| Clemson to Creazzo | 4,747.96 mi (7,641.10 km) |
| Clemson to Crema | 4,676.20 mi (7,525.62 km) |
| Clemson to Cremona | 4,698.75 mi (7,561.91 km) |
| Clemson to Crevalcore | 4,760.50 mi (7,661.28 km) |
| Clemson to Crispiano | 5,171.37 mi (8,322.51 km) |
| Clemson to Crosia | 5,189.53 mi (8,351.74 km) |
| Clemson to Crotone | 5,223.44 mi (8,406.32 km) |
| Clemson to Cuneo | 4,613.87 mi (7,425.31 km) |
| Clemson to Cuorgne | 4,587.38 mi (7,382.68 km) |
| Clemson to Cusano Milanino | 4,648.86 mi (7,481.62 km) |
| Clemson to Cutro | 5,219.33 mi (8,399.70 km) |
