| Mason City to Cividale del Friuli | 4,811.42 mi (7,743.23 km) |
| Mason City to Civita Castellana | 4,949.69 mi (7,965.76 km) |
| Mason City to Civitanova Marche | 4,952.37 mi (7,970.07 km) |
| Mason City to Civitavecchia | 4,935.61 mi (7,943.10 km) |
| Mason City to Civitella in Val di Chiana | 4,871.84 mi (7,840.46 km) |
| Mason City to Clusone | 4,694.77 mi (7,555.50 km) |
| Mason City to Coccaglio | 4,710.03 mi (7,580.06 km) |
| Mason City to Codigoro | 4,821.82 mi (7,759.98 km) |
| Mason City to Codogno | 4,717.81 mi (7,592.58 km) |
| Mason City to Codroipo | 4,801.47 mi (7,727.22 km) |
| Mason City to Cogoleto | 4,712.11 mi (7,583.40 km) |
| Mason City to Colle di Val d'Elsa | 4,850.65 mi (7,806.37 km) |
| Mason City to Colle Salvetti | 4,817.02 mi (7,752.24 km) |
| Mason City to Collecchio | 4,755.21 mi (7,652.77 km) |
| Mason City to Colleferro | 4,998.92 mi (8,044.98 km) |
