| Mason City to Cognac | 4,308.71 mi (6,934.20 km) |
| Mason City to Cogolin | 4,680.38 mi (7,532.34 km) |
| Mason City to Colmar | 4,504.25 mi (7,248.88 km) |
| Mason City to Colombes | 4,281.43 mi (6,890.30 km) |
| Mason City to Colomiers | 4,458.90 mi (7,175.90 km) |
| Mason City to Combs-la-Ville | 4,302.93 mi (6,924.90 km) |
| Mason City to Comines | 4,237.40 mi (6,819.44 km) |
| Mason City to Compiegne | 4,283.32 mi (6,893.34 km) |
| Mason City to Concarneau | 4,084.17 mi (6,572.83 km) |
| Mason City to Conde-sur-l'Escaut | 4,270.67 mi (6,872.97 km) |
| Mason City to Conflans-Sainte-Honorine | 4,272.72 mi (6,876.27 km) |
| Mason City to Corbas | 4,514.09 mi (7,264.72 km) |
| Mason City to Corbeil-Essonnes | 4,302.23 mi (6,923.77 km) |
| Mason City to Cormeilles-en-Parisis | 4,277.56 mi (6,884.07 km) |
| Mason City to Cosne sur Loire | 4,366.96 mi (7,027.95 km) |
