| Rockford to Decatur (Alabama) | 542.77 mi (873.50 km) |
| Rockford to Decatur (Georgia) | 641.07 mi (1,031.70 km) |
| Rockford to Decatur (Illinois) | 166.23 mi (267.52 km) |
| Rockford to Deer Park (New York) | 819.83 mi (1,319.39 km) |
| Rockford to Deer Park (Texas) | 931.41 mi (1,498.96 km) |
| Rockford to Deerfield (Illinois) | 62.38 mi (100.40 km) |
| Rockford to Deerfield Beach (Florida) | 1,212.95 mi (1,952.06 km) |
| Rockford to Defiance (Ohio) | 251.33 mi (404.47 km) |
| Rockford to DeForest (Wisconsin) | 68.53 mi (110.29 km) |
| Rockford to DeKalb (Illinois) | 27.87 mi (44.85 km) |
| Rockford to Del Aire (California) | 1,684.59 mi (2,711.09 km) |
| Rockford to Del City (Oklahoma) | 650.99 mi (1,047.66 km) |
| Rockford to Del Rio (Texas) | 1,107.27 mi (1,781.98 km) |
| Rockford to DeLand (Florida) | 1,012.37 mi (1,629.25 km) |
| Rockford to Delano (California) | 1,672.44 mi (2,691.53 km) |
