| Rockford to Fortuna (California) | 1,808.18 mi (2,909.99 km) |
| Rockford to Fortuna Foothills (Arizona) | 1,531.65 mi (2,464.95 km) |
| Rockford to Foster City (California) | 1,777.81 mi (2,861.11 km) |
| Rockford to Fostoria (Ohio) | 301.20 mi (484.73 km) |
| Rockford to Fountain (Colorado) | 855.76 mi (1,377.21 km) |
| Rockford to Fountain Hills (Arizona) | 1,366.97 mi (2,199.93 km) |
| Rockford to Fountain Inn (South Carolina) | 640.37 mi (1,030.57 km) |
| Rockford to Fountain Valley (California) | 1,670.48 mi (2,688.39 km) |
| Rockford to Fountainebleau (Florida) | 1,242.07 mi (1,998.91 km) |
| Rockford to Four Corners (Oregon) | 1,694.35 mi (2,726.79 km) |
| Rockford to Four Corners (Texas) | 944.02 mi (1,519.25 km) |
| Rockford to Four Square Mile (Colorado) | 843.20 mi (1,357.00 km) |
| Rockford to Fox Crossing (Wisconsin) | 138.83 mi (223.43 km) |
| Rockford to Fox Lake (Illinois) | 46.33 mi (74.57 km) |
| Rockford to Framingham (Massachusetts) | 899.43 mi (1,447.49 km) |
