| Rock Island to Dover (New Hampshire) | 1,010.79 mi (1,626.71 km) |
| Rock Island to Dover (New Jersey) | 833.05 mi (1,340.66 km) |
| Rock Island to Dover (Ohio) | 478.82 mi (770.59 km) |
| Rock Island to Downers Grove (Illinois) | 134.37 mi (216.25 km) |
| Rock Island to Downey (California) | 1,585.25 mi (2,551.21 km) |
| Rock Island to Dranesville (Virginia) | 716.85 mi (1,153.65 km) |
| Rock Island to Draper (Utah) | 1,109.07 mi (1,784.87 km) |
| Rock Island to Drexel Heights (Arizona) | 1,297.80 mi (2,088.61 km) |
| Rock Island to Drexel Hill (Pennsylvania) | 806.01 mi (1,297.15 km) |
| Rock Island to Duarte (California) | 1,569.03 mi (2,525.11 km) |
| Rock Island to Dublin (California) | 1,677.90 mi (2,700.33 km) |
| Rock Island to Dublin (Georgia) | 747.23 mi (1,202.55 km) |
| Rock Island to Dublin (Ohio) | 400.07 mi (643.86 km) |
| Rock Island to Dubuque (Iowa) | 71.47 mi (115.02 km) |
| Rock Island to Duluth (Georgia) | 623.73 mi (1,003.79 km) |
