| Mason City to Collegno | 4,641.21 mi (7,469.31 km) |
| Mason City to Cologno al Serio | 4,698.83 mi (7,562.04 km) |
| Mason City to Cologno Monzese | 4,685.58 mi (7,540.71 km) |
| Mason City to Colorno | 4,753.20 mi (7,649.54 km) |
| Mason City to Comacchio | 4,830.37 mi (7,773.73 km) |
| Mason City to Comiso | 5,287.99 mi (8,510.20 km) |
| Mason City to Como | 4,666.02 mi (7,509.24 km) |
| Mason City to Concordia Sagittaria | 4,805.79 mi (7,734.18 km) |
| Mason City to Concorezzo | 4,685.03 mi (7,539.82 km) |
| Mason City to Conegliano | 4,780.35 mi (7,693.23 km) |
| Mason City to Conselice | 4,825.84 mi (7,766.44 km) |
| Mason City to Conselve | 4,794.41 mi (7,715.86 km) |
| Mason City to Conversano | 5,189.04 mi (8,350.95 km) |
| Mason City to Copertino | 5,257.85 mi (8,461.69 km) |
| Mason City to Copparo | 4,808.36 mi (7,738.31 km) |
