| Mason City to Cibolo (Texas) | 978.71 mi (1,575.08 km) |
| Mason City to Cicero (Illinois) | 291.37 mi (468.91 km) |
| Mason City to Cimarron Hills (Colorado) | 668.05 mi (1,075.13 km) |
| Mason City to Cincinnati (Ohio) | 529.93 mi (852.85 km) |
| Mason City to Cinco Ranch (Texas) | 937.23 mi (1,508.32 km) |
| Mason City to Circleville (Ohio) | 585.30 mi (941.95 km) |
| Mason City to Citrus (California) | 1,464.14 mi (2,356.30 km) |
| Mason City to Citrus Heights (California) | 1,490.93 mi (2,399.42 km) |
| Mason City to Citrus Park (Florida) | 1,198.50 mi (1,928.80 km) |
| Mason City to Claiborne (Louisiana) | 735.15 mi (1,183.11 km) |
| Mason City to Claremont (California) | 1,455.39 mi (2,342.22 km) |
| Mason City to Claremont (New Hampshire) | 1,047.08 mi (1,685.11 km) |
| Mason City to Claremore (Oklahoma) | 489.18 mi (787.26 km) |
| Mason City to Clarksburg (Maryland) | 870.14 mi (1,400.35 km) |
| Mason City to Clarksburg (West Virginia) | 719.52 mi (1,157.96 km) |
