| Mason City to Dixon (California) | 1,524.17 mi (2,452.91 km) |
| Mason City to Dixon (Illinois) | 209.85 mi (337.72 km) |
| Mason City to Dobbs Ferry (New York) | 999.89 mi (1,609.18 km) |
| Mason City to Doctor Phillips (Florida) | 1,206.53 mi (1,941.71 km) |
| Mason City to Dodge City (Kansas) | 516.44 mi (831.13 km) |
| Mason City to Dolton (Illinois) | 304.48 mi (490.01 km) |
| Mason City to Donna (Texas) | 1,206.14 mi (1,941.09 km) |
| Mason City to Dorado (Puerto Rico) | 2,316.63 mi (3,728.26 km) |
| Mason City to Doral (Florida) | 1,399.55 mi (2,252.35 km) |
| Mason City to Doraville (Georgia) | 799.35 mi (1,286.44 km) |
| Mason City to Dothan (Alabama) | 927.26 mi (1,492.27 km) |
| Mason City to Douglas (Arizona) | 1,208.75 mi (1,945.30 km) |
| Mason City to Douglas (Georgia) | 983.23 mi (1,582.35 km) |
| Mason City to Douglasville (Georgia) | 795.31 mi (1,279.93 km) |
| Mason City to Dover (Delaware) | 958.01 mi (1,541.77 km) |
