| Hard to Dover (New Jersey) | 3,989.79 mi (6,420.94 km) |
| Hard to Dover (Ohio) | 4,287.94 mi (6,900.77 km) |
| Hard to Downers Grove (Illinois) | 4,486.24 mi (7,219.90 km) |
| Hard to Downey (California) | 5,949.87 mi (9,575.39 km) |
| Hard to Dranesville (Virginia) | 4,187.52 mi (6,739.16 km) |
| Hard to Draper (Utah) | 5,381.55 mi (8,660.77 km) |
| Hard to Drexel Heights (Arizona) | 5,822.71 mi (9,370.75 km) |
| Hard to Drexel Hill (Pennsylvania) | 4,060.32 mi (6,534.46 km) |
| Hard to Duarte (California) | 5,931.31 mi (9,545.53 km) |
| Hard to Dublin (California) | 5,837.16 mi (9,394.00 km) |
| Hard to Dublin (Georgia) | 4,716.12 mi (7,589.86 km) |
| Hard to Dublin (Ohio) | 4,373.42 mi (7,038.33 km) |
| Hard to Dubuque (Iowa) | 4,554.23 mi (7,329.32 km) |
| Hard to Duluth (Georgia) | 4,697.70 mi (7,560.21 km) |
| Hard to Duluth (Minnesota) | 4,404.75 mi (7,088.76 km) |
