| Rockford to Duluth (Minnesota) | 346.79 mi (558.11 km) |
| Rockford to Dumas (Texas) | 819.84 mi (1,319.40 km) |
| Rockford to Dumont (New Jersey) | 782.93 mi (1,260.00 km) |
| Rockford to Duncan (Oklahoma) | 716.43 mi (1,152.99 km) |
| Rockford to Duncanville (Texas) | 790.72 mi (1,272.53 km) |
| Rockford to Dundalk (Maryland) | 688.68 mi (1,108.33 km) |
| Rockford to Dunedin (Florida) | 1,044.21 mi (1,680.49 km) |
| Rockford to Dunkirk (New York) | 496.73 mi (799.41 km) |
| Rockford to Dunmore (Pennsylvania) | 694.44 mi (1,117.60 km) |
| Rockford to Dunwoody (Georgia) | 629.83 mi (1,013.62 km) |
| Rockford to Durango (Colorado) | 1,054.48 mi (1,697.02 km) |
| Rockford to Durant (Oklahoma) | 695.60 mi (1,119.46 km) |
| Rockford to Durham (North Carolina) | 695.57 mi (1,119.42 km) |
| Rockford to Dyer (Indiana) | 95.76 mi (154.11 km) |
| Rockford to Dyersburg (Tennessee) | 429.61 mi (691.39 km) |
