| Helena to Dover (New Hampshire) | 2,004.16 mi (3,225.38 km) |
| Helena to Dover (New Jersey) | 1,892.38 mi (3,045.49 km) |
| Helena to Dover (Ohio) | 1,574.42 mi (2,533.79 km) |
| Helena to Downers Grove (Illinois) | 1,229.07 mi (1,977.99 km) |
| Helena to Downey (California) | 931.34 mi (1,498.84 km) |
| Helena to Dranesville (Virginia) | 1,817.10 mi (2,924.34 km) |
| Helena to Draper (Utah) | 421.60 mi (678.50 km) |
| Helena to Drexel Heights (Arizona) | 999.81 mi (1,609.04 km) |
| Helena to Drexel Hill (Pennsylvania) | 1,884.92 mi (3,033.49 km) |
| Helena to Duarte (California) | 913.46 mi (1,470.08 km) |
| Helena to Dublin (California) | 793.92 mi (1,277.69 km) |
| Helena to Dublin (Georgia) | 1,812.96 mi (2,917.67 km) |
| Helena to Dublin (Ohio) | 1,508.56 mi (2,427.80 km) |
| Helena to Dubuque (Iowa) | 1,083.22 mi (1,743.27 km) |
| Helena to Duluth (Georgia) | 1,693.61 mi (2,725.60 km) |
