| Rockford to Dover (New Hampshire) | 923.16 mi (1,485.69 km) |
| Rockford to Dover (New Jersey) | 754.77 mi (1,214.68 km) |
| Rockford to Dover (Ohio) | 410.65 mi (660.88 km) |
| Rockford to Downers Grove (Illinois) | 62.59 mi (100.73 km) |
| Rockford to Downey (California) | 1,671.91 mi (2,690.68 km) |
| Rockford to Dranesville (Virginia) | 652.74 mi (1,050.48 km) |
| Rockford to Draper (Utah) | 1,184.59 mi (1,906.42 km) |
| Rockford to Drexel Heights (Arizona) | 1,391.07 mi (2,238.71 km) |
| Rockford to Drexel Hill (Pennsylvania) | 733.07 mi (1,179.77 km) |
| Rockford to Duarte (California) | 1,655.46 mi (2,664.21 km) |
| Rockford to Dublin (California) | 1,754.96 mi (2,824.33 km) |
| Rockford to Dublin (Georgia) | 751.01 mi (1,208.63 km) |
| Rockford to Dublin (Ohio) | 341.58 mi (549.72 km) |
| Rockford to Dubuque (Iowa) | 85.49 mi (137.58 km) |
| Rockford to Duluth (Georgia) | 629.48 mi (1,013.04 km) |
