| Helena to Duluth (Minnesota) | 939.87 mi (1,512.58 km) |
| Helena to Dumas (Texas) | 905.69 mi (1,457.56 km) |
| Helena to Dumont (New Jersey) | 1,917.59 mi (3,086.06 km) |
| Helena to Duncan (Oklahoma) | 1,110.74 mi (1,787.56 km) |
| Helena to Duncanville (Texas) | 1,250.69 mi (2,012.79 km) |
| Helena to Dundalk (Maryland) | 1,849.70 mi (2,976.80 km) |
| Helena to Dunedin (Florida) | 2,035.32 mi (3,275.53 km) |
| Helena to Dunkirk (New York) | 1,622.69 mi (2,611.46 km) |
| Helena to Dunmore (Pennsylvania) | 1,827.68 mi (2,941.36 km) |
| Helena to Dunwoody (Georgia) | 1,689.17 mi (2,718.45 km) |
| Helena to Durango (Colorado) | 678.67 mi (1,092.22 km) |
| Helena to Durant (Oklahoma) | 1,194.13 mi (1,921.76 km) |
| Helena to Durham (North Carolina) | 1,852.03 mi (2,980.56 km) |
| Helena to Dyer (Indiana) | 1,261.41 mi (2,030.05 km) |
| Helena to Dyersburg (Tennessee) | 1,375.11 mi (2,213.03 km) |
