| Mason City to Castle Pines (Colorado) | 656.38 mi (1,056.34 km) |
| Mason City to Castle Rock (Colorado) | 658.25 mi (1,059.35 km) |
| Mason City to Castro Valley (California) | 1,555.47 mi (2,503.28 km) |
| Mason City to Catalina Foothills (Arizona) | 1,218.49 mi (1,960.98 km) |
| Mason City to Cataño (Puerto Rico) | 2,323.24 mi (3,738.89 km) |
| Mason City to Cathedral City (California) | 1,406.50 mi (2,263.54 km) |
| Mason City to Catonsville (Maryland) | 894.84 mi (1,440.11 km) |
| Mason City to Cave Spring (Virginia) | 806.31 mi (1,297.63 km) |
| Mason City to Cayce (South Carolina) | 912.43 mi (1,468.41 km) |
| Mason City to Cayey (Puerto Rico) | 2,340.37 mi (3,766.46 km) |
| Mason City to Cedar City (Utah) | 1,109.37 mi (1,785.36 km) |
| Mason City to Cedar Falls (Iowa) | 57.61 mi (92.72 km) |
| Mason City to Cedar Hill (Texas) | 758.18 mi (1,220.17 km) |
| Mason City to Cedar Lake (Indiana) | 319.12 mi (513.57 km) |
| Mason City to Cedar Mill (Oregon) | 1,463.57 mi (2,355.39 km) |
