| Grayslake to Fortuna (California) | 1,859.44 mi (2,992.48 km) |
| Grayslake to Fortuna Foothills (Arizona) | 1,583.66 mi (2,548.66 km) |
| Grayslake to Foster City (California) | 1,830.36 mi (2,945.68 km) |
| Grayslake to Fostoria (Ohio) | 251.77 mi (405.19 km) |
| Grayslake to Fountain (Colorado) | 908.50 mi (1,462.09 km) |
| Grayslake to Fountain Hills (Arizona) | 1,418.79 mi (2,283.32 km) |
| Grayslake to Fountain Inn (South Carolina) | 614.61 mi (989.12 km) |
| Grayslake to Fountain Valley (California) | 1,723.25 mi (2,773.31 km) |
| Grayslake to Fountainebleau (Florida) | 1,225.08 mi (1,971.57 km) |
| Grayslake to Four Corners (Oregon) | 1,742.73 mi (2,804.65 km) |
| Grayslake to Four Corners (Texas) | 972.63 mi (1,565.30 km) |
| Grayslake to Four Square Mile (Colorado) | 896.14 mi (1,442.20 km) |
| Grayslake to Fox Crossing (Wisconsin) | 131.94 mi (212.34 km) |
| Grayslake to Fox Lake (Illinois) | 9.61 mi (15.46 km) |
| Grayslake to Framingham (Massachusetts) | 846.49 mi (1,362.29 km) |
