| Mason City to Darby (Pennsylvania) | 952.19 mi (1,532.40 km) |
| Mason City to Dardenne Prairie (Missouri) | 329.62 mi (530.48 km) |
| Mason City to Darien (Illinois) | 283.08 mi (455.58 km) |
| Mason City to Davenport (Iowa) | 172.18 mi (277.10 km) |
| Mason City to Davidson (North Carolina) | 845.81 mi (1,361.19 km) |
| Mason City to Davie (Florida) | 1,385.52 mi (2,229.78 km) |
| Mason City to Davis (California) | 1,517.01 mi (2,441.39 km) |
| Mason City to Dayton (Nevada) | 1,390.62 mi (2,237.98 km) |
| Mason City to Dayton (Ohio) | 520.45 mi (837.58 km) |
| Mason City to Daytona Beach (Florida) | 1,173.88 mi (1,889.17 km) |
| Mason City to De Pere (Wisconsin) | 270.30 mi (435.00 km) |
| Mason City to De Witt (New York) | 862.26 mi (1,387.68 km) |
| Mason City to Dearborn (Michigan) | 509.82 mi (820.48 km) |
| Mason City to Dearborn Heights (Michigan) | 506.56 mi (815.23 km) |
| Mason City to DeBary (Florida) | 1,185.65 mi (1,908.13 km) |
