| Helena to Dixon (California) | 751.39 mi (1,209.25 km) |
| Helena to Dixon (Illinois) | 1,158.88 mi (1,865.04 km) |
| Helena to Dobbs Ferry (New York) | 1,921.47 mi (3,092.30 km) |
| Helena to Doctor Phillips (Florida) | 2,069.07 mi (3,329.84 km) |
| Helena to Dodge City (Kansas) | 864.34 mi (1,391.03 km) |
| Helena to Dolton (Illinois) | 1,253.50 mi (2,017.32 km) |
| Helena to Donna (Texas) | 1,606.83 mi (2,585.95 km) |
| Helena to Dorado (Puerto Rico) | 3,231.50 mi (5,200.60 km) |
| Helena to Doral (Florida) | 2,249.41 mi (3,620.07 km) |
| Helena to Doraville (Georgia) | 1,692.50 mi (2,723.82 km) |
| Helena to Dothan (Alabama) | 1,767.09 mi (2,843.85 km) |
| Helena to Douglas (Arizona) | 1,060.98 mi (1,707.48 km) |
| Helena to Douglas (Georgia) | 1,863.47 mi (2,998.96 km) |
| Helena to Douglasville (Georgia) | 1,680.81 mi (2,705.00 km) |
| Helena to Dover (Delaware) | 1,899.39 mi (3,056.78 km) |
