| Mason City to Cortona | 4,888.50 mi (7,867.29 km) |
| Mason City to Cosenza | 5,237.82 mi (8,429.46 km) |
| Mason City to Cossato | 4,642.35 mi (7,471.14 km) |
| Mason City to Costa Volpino | 4,702.61 mi (7,568.12 km) |
| Mason City to Creazzo | 4,766.77 mi (7,671.37 km) |
| Mason City to Crema | 4,707.82 mi (7,576.51 km) |
| Mason City to Cremona | 4,731.23 mi (7,614.18 km) |
| Mason City to Crevalcore | 4,791.44 mi (7,711.08 km) |
| Mason City to Crispiano | 5,211.27 mi (8,386.73 km) |
| Mason City to Crosia | 5,244.35 mi (8,439.96 km) |
| Mason City to Crotone | 5,281.22 mi (8,499.30 km) |
| Mason City to Cuneo | 4,670.58 mi (7,516.58 km) |
| Mason City to Cuorgne | 4,630.59 mi (7,452.21 km) |
| Mason City to Cusano Milanino | 4,681.10 mi (7,533.50 km) |
| Mason City to Cutro | 5,278.62 mi (8,495.12 km) |
