| Keystone to Fortuna (California) | 2,494.12 mi (4,013.90 km) |
| Keystone to Fortuna Foothills (Arizona) | 1,913.41 mi (3,079.33 km) |
| Keystone to Foster City (California) | 2,373.74 mi (3,820.16 km) |
| Keystone to Fostoria (Ohio) | 901.37 mi (1,450.62 km) |
| Keystone to Fountain (Colorado) | 1,462.03 mi (2,352.91 km) |
| Keystone to Fountain Hills (Arizona) | 1,762.87 mi (2,837.07 km) |
| Keystone to Fountain Inn (South Carolina) | 454.39 mi (731.28 km) |
| Keystone to Fountain Valley (California) | 2,120.00 mi (3,411.81 km) |
| Keystone to Fountainebleau (Florida) | 214.08 mi (344.52 km) |
| Keystone to Four Corners (Oregon) | 2,489.92 mi (4,007.15 km) |
| Keystone to Four Corners (Texas) | 796.64 mi (1,282.07 km) |
| Keystone to Four Square Mile (Colorado) | 1,500.26 mi (2,414.44 km) |
| Keystone to Fox Crossing (Wisconsin) | 1,158.31 mi (1,864.12 km) |
| Keystone to Fox Lake (Illinois) | 1,035.91 mi (1,667.14 km) |
| Keystone to Framingham (Massachusetts) | 1,162.36 mi (1,870.63 km) |
