| Boulder to Fortuna Foothills (Arizona) | 718.84 mi (1,156.85 km) |
| Boulder to Foster City (California) | 930.50 mi (1,497.49 km) |
| Boulder to Fostoria (Ohio) | 1,145.55 mi (1,843.59 km) |
| Boulder to Fountain (Colorado) | 97.21 mi (156.44 km) |
| Boulder to Fountain Hills (Arizona) | 570.06 mi (917.42 km) |
| Boulder to Fountain Inn (South Carolina) | 1,314.08 mi (2,114.80 km) |
| Boulder to Fountain Valley (California) | 825.23 mi (1,328.08 km) |
| Boulder to Fountainebleau (Florida) | 1,738.74 mi (2,798.24 km) |
| Boulder to Four Corners (Oregon) | 962.07 mi (1,548.31 km) |
| Boulder to Four Corners (Texas) | 897.49 mi (1,444.36 km) |
| Boulder to Four Square Mile (Colorado) | 30.64 mi (49.30 km) |
| Boulder to Fox Crossing (Wisconsin) | 905.38 mi (1,457.07 km) |
| Boulder to Fox Lake (Illinois) | 900.72 mi (1,449.57 km) |
| Boulder to Framingham (Massachusetts) | 1,754.33 mi (2,823.31 km) |
| Boulder to Franconia (Virginia) | 1,496.31 mi (2,408.09 km) |
