| Mason City to Cullman (Alabama) | 707.93 mi (1,139.30 km) |
| Mason City to Culpeper (Virginia) | 856.50 mi (1,378.40 km) |
| Mason City to Culver City (California) | 1,492.74 mi (2,402.33 km) |
| Mason City to Cumberland (Maryland) | 785.30 mi (1,263.82 km) |
| Mason City to Cupertino (California) | 1,565.48 mi (2,519.39 km) |
| Mason City to Cutler Bay (Florida) | 1,414.74 mi (2,276.81 km) |
| Mason City to Cutlerville (Michigan) | 380.82 mi (612.87 km) |
| Mason City to Cuyahoga Falls (Ohio) | 613.16 mi (986.78 km) |
| Mason City to Cypress (California) | 1,482.53 mi (2,385.90 km) |
| Mason City to Cypress Gardens (Florida) | 1,227.60 mi (1,975.62 km) |
| Mason City to Cypress Lake (Florida) | 1,311.51 mi (2,110.66 km) |
| Mason City to D'Iberville (Mississippi) | 907.31 mi (1,460.17 km) |
| Mason City to Dakota Ridge (Colorado) | 664.27 mi (1,069.03 km) |
| Mason City to Dale City (Virginia) | 882.75 mi (1,420.66 km) |
| Mason City to Dallas (Georgia) | 780.81 mi (1,256.59 km) |
