| Rockford to Frederick (Colorado) | 839.06 mi (1,350.33 km) |
| Rockford to Frederick (Maryland) | 638.82 mi (1,028.08 km) |
| Rockford to Fredericksburg (Texas) | 991.13 mi (1,595.07 km) |
| Rockford to Fredericksburg (Virginia) | 668.03 mi (1,075.08 km) |
| Rockford to Frederickson (Washington) | 1,656.45 mi (2,665.79 km) |
| Rockford to Freeport (Illinois) | 29.24 mi (47.06 km) |
| Rockford to Freeport (New York) | 808.07 mi (1,300.46 km) |
| Rockford to Freeport (Texas) | 984.83 mi (1,584.94 km) |
| Rockford to Fremont (California) | 1,764.13 mi (2,839.09 km) |
| Rockford to Fremont (Nebraska) | 386.11 mi (621.38 km) |
| Rockford to Fremont (Ohio) | 312.66 mi (503.18 km) |
| Rockford to French Valley (California) | 1,631.95 mi (2,626.37 km) |
| Rockford to Fresno (California) | 1,671.25 mi (2,689.62 km) |
| Rockford to Fresno (Texas) | 948.69 mi (1,526.77 km) |
| Rockford to Fridley (Minnesota) | 286.37 mi (460.86 km) |
