| Helena to Darby (Pennsylvania) | 1,887.83 mi (3,038.16 km) |
| Helena to Dardenne Prairie (Missouri) | 1,204.21 mi (1,937.98 km) |
| Helena to Darien (Illinois) | 1,232.12 mi (1,982.90 km) |
| Helena to Davenport (Iowa) | 1,114.46 mi (1,793.55 km) |
| Helena to Davidson (North Carolina) | 1,782.35 mi (2,868.41 km) |
| Helena to Davie (Florida) | 2,238.82 mi (3,603.04 km) |
| Helena to Davis (California) | 742.57 mi (1,195.05 km) |
| Helena to Dayton (Nevada) | 633.95 mi (1,020.25 km) |
| Helena to Dayton (Ohio) | 1,469.43 mi (2,364.81 km) |
| Helena to Daytona Beach (Florida) | 2,049.10 mi (3,297.71 km) |
| Helena to De Pere (Wisconsin) | 1,164.22 mi (1,873.63 km) |
| Helena to De Witt (New York) | 1,763.11 mi (2,837.44 km) |
| Helena to Dearborn (Michigan) | 1,442.72 mi (2,321.83 km) |
| Helena to Dearborn Heights (Michigan) | 1,439.59 mi (2,316.80 km) |
| Helena to DeBary (Florida) | 2,054.88 mi (3,307.01 km) |
