| Mason City to Coudekerque-Branche | 4,204.93 mi (6,767.18 km) |
| Mason City to Coueron | 4,195.03 mi (6,751.25 km) |
| Mason City to Coulommiers | 4,316.69 mi (6,947.05 km) |
| Mason City to Courbevoic | 4,282.48 mi (6,891.98 km) |
| Mason City to Courcouronnes | 4,299.86 mi (6,919.96 km) |
| Mason City to Cournon-d'Auvergne | 4,445.24 mi (7,153.92 km) |
| Mason City to Courrieres | 4,247.00 mi (6,834.89 km) |
| Mason City to Coutras | 4,342.55 mi (6,988.66 km) |
| Mason City to Couzeix | 4,363.42 mi (7,022.24 km) |
| Mason City to Cran-Gevrier | 4,550.02 mi (7,322.54 km) |
| Mason City to Craponne | 4,504.00 mi (7,248.49 km) |
| Mason City to Creil | 4,276.90 mi (6,883.00 km) |
| Mason City to Crepy-en-Valois | 4,292.82 mi (6,908.63 km) |
| Mason City to Crest | 4,558.31 mi (7,335.90 km) |
| Mason City to Creteil | 4,294.51 mi (6,911.35 km) |
