| Mason City to Commerce (California) | 1,481.27 mi (2,383.87 km) |
| Mason City to Commerce City (Colorado) | 643.10 mi (1,034.97 km) |
| Mason City to Compton (California) | 1,488.77 mi (2,395.94 km) |
| Mason City to Comstock Park (Michigan) | 379.44 mi (610.65 km) |
| Mason City to Concord (California) | 1,545.34 mi (2,486.99 km) |
| Mason City to Concord (Missouri) | 353.11 mi (568.27 km) |
| Mason City to Concord (New Hampshire) | 1,087.09 mi (1,749.51 km) |
| Mason City to Concord (North Carolina) | 857.84 mi (1,380.55 km) |
| Mason City to Conneaut (Ohio) | 647.93 mi (1,042.74 km) |
| Mason City to Connersville (Indiana) | 481.96 mi (775.63 km) |
| Mason City to Conroe (Texas) | 894.98 mi (1,440.34 km) |
| Mason City to Converse (Texas) | 983.85 mi (1,583.36 km) |
| Mason City to Conway (Arkansas) | 559.18 mi (899.92 km) |
| Mason City to Conway (Florida) | 1,208.38 mi (1,944.70 km) |
| Mason City to Conway (South Carolina) | 997.41 mi (1,605.17 km) |
