| Rockford to Delaware (Ohio) | 339.55 mi (546.45 km) |
| Rockford to Delhi (California) | 1,704.73 mi (2,743.49 km) |
| Rockford to Delray Beach (Florida) | 1,204.26 mi (1,938.07 km) |
| Rockford to Deltona (Florida) | 1,021.59 mi (1,644.09 km) |
| Rockford to Deming (New Mexico) | 1,233.85 mi (1,985.69 km) |
| Rockford to Denison (Texas) | 714.68 mi (1,150.17 km) |
| Rockford to Dent (Ohio) | 313.15 mi (503.96 km) |
| Rockford to Denton (Texas) | 764.11 mi (1,229.72 km) |
| Rockford to Dentsville (South Carolina) | 716.06 mi (1,152.39 km) |
| Rockford to Denver (Colorado) | 840.93 mi (1,353.35 km) |
| Rockford to Depew (New York) | 528.59 mi (850.69 km) |
| Rockford to Derby (Connecticut) | 824.52 mi (1,326.93 km) |
| Rockford to Derby (Kansas) | 541.82 mi (871.98 km) |
| Rockford to Des Moines (Iowa) | 238.49 mi (383.82 km) |
| Rockford to Des Moines (Washington) | 1,654.23 mi (2,662.23 km) |
