| Mason City to Des Plaines (Illinois) | 280.26 mi (451.03 km) |
| Mason City to Desert Hot Springs (California) | 1,405.67 mi (2,262.20 km) |
| Mason City to DeSoto (Texas) | 755.58 mi (1,215.98 km) |
| Mason City to Destin (Florida) | 955.84 mi (1,538.28 km) |
| Mason City to Destrehan (Louisiana) | 924.37 mi (1,487.64 km) |
| Mason City to Detroit (Michigan) | 514.58 mi (828.13 km) |
| Mason City to Diamond Bar (California) | 1,464.98 mi (2,357.65 km) |
| Mason City to Diamond Springs (California) | 1,468.39 mi (2,363.15 km) |
| Mason City to Dickinson (North Dakota) | 534.61 mi (860.38 km) |
| Mason City to Dickinson (Texas) | 951.73 mi (1,531.67 km) |
| Mason City to Dickson (Tennessee) | 579.35 mi (932.37 km) |
| Mason City to Difficult Run (Virginia) | 875.22 mi (1,408.54 km) |
| Mason City to Dinuba (California) | 1,455.71 mi (2,342.73 km) |
| Mason City to Discovery Bay (California) | 1,526.84 mi (2,457.22 km) |
| Mason City to Dix Hills (New York) | 1,030.51 mi (1,658.45 km) |
