| Rockford to Darby (Pennsylvania) | 735.82 mi (1,184.19 km) |
| Rockford to Dardenne Prairie (Missouri) | 257.40 mi (414.24 km) |
| Rockford to Darien (Illinois) | 65.96 mi (106.15 km) |
| Rockford to Davenport (Iowa) | 92.96 mi (149.60 km) |
| Rockford to Davidson (North Carolina) | 644.04 mi (1,036.49 km) |
| Rockford to Davie (Florida) | 1,223.71 mi (1,969.37 km) |
| Rockford to Davis (California) | 1,727.13 mi (2,779.54 km) |
| Rockford to Dayton (Nevada) | 1,601.03 mi (2,576.60 km) |
| Rockford to Dayton (Ohio) | 305.90 mi (492.30 km) |
| Rockford to Daytona Beach (Florida) | 1,005.77 mi (1,618.62 km) |
| Rockford to De Pere (Wisconsin) | 157.97 mi (254.23 km) |
| Rockford to De Witt (New York) | 661.27 mi (1,064.20 km) |
| Rockford to Dearborn (Michigan) | 299.04 mi (481.25 km) |
| Rockford to Dearborn Heights (Michigan) | 295.77 mi (475.99 km) |
| Rockford to DeBary (Florida) | 1,020.46 mi (1,642.27 km) |
