| Rock Island to Fortuna (California) | 1,739.26 mi (2,799.07 km) |
| Rock Island to Fortuna Foothills (Arizona) | 1,440.81 mi (2,318.76 km) |
| Rock Island to Foster City (California) | 1,700.64 mi (2,736.91 km) |
| Rock Island to Fostoria (Ohio) | 372.63 mi (599.69 km) |
| Rock Island to Fountain (Colorado) | 768.83 mi (1,237.31 km) |
| Rock Island to Fountain Hills (Arizona) | 1,275.60 mi (2,052.88 km) |
| Rock Island to Fountain Inn (South Carolina) | 652.56 mi (1,050.20 km) |
| Rock Island to Fountain Valley (California) | 1,583.36 mi (2,548.18 km) |
| Rock Island to Fountainebleau (Florida) | 1,232.03 mi (1,982.75 km) |
| Rock Island to Four Corners (Oregon) | 1,637.71 mi (2,635.64 km) |
| Rock Island to Four Corners (Texas) | 863.31 mi (1,389.37 km) |
| Rock Island to Four Square Mile (Colorado) | 759.94 mi (1,223.00 km) |
| Rock Island to Fox Crossing (Wisconsin) | 218.07 mi (350.96 km) |
| Rock Island to Fox Lake (Illinois) | 139.76 mi (224.92 km) |
| Rock Island to Framingham (Massachusetts) | 984.40 mi (1,584.25 km) |
