| Hard to Dardenne Prairie (Missouri) | 4,734.41 mi (7,619.30 km) |
| Hard to Darien (Illinois) | 4,487.23 mi (7,221.51 km) |
| Hard to Davenport (Iowa) | 4,595.24 mi (7,395.33 km) |
| Hard to Davidson (North Carolina) | 4,489.59 mi (7,225.30 km) |
| Hard to Davie (Florida) | 4,910.93 mi (7,903.38 km) |
| Hard to Davis (California) | 5,782.84 mi (9,306.58 km) |
| Hard to Dayton (Nevada) | 5,680.67 mi (9,142.16 km) |
| Hard to Dayton (Ohio) | 4,430.51 mi (7,130.22 km) |
| Hard to Daytona Beach (Florida) | 4,796.50 mi (7,719.21 km) |
| Hard to De Pere (Wisconsin) | 4,366.97 mi (7,027.97 km) |
| Hard to De Witt (New York) | 3,962.83 mi (6,377.56 km) |
| Hard to Dearborn (Michigan) | 4,277.26 mi (6,883.59 km) |
| Hard to Dearborn Heights (Michigan) | 4,279.60 mi (6,887.35 km) |
| Hard to DeBary (Florida) | 4,821.56 mi (7,759.54 km) |
| Hard to Decatur (Alabama) | 4,787.75 mi (7,705.13 km) |
