| Boulder to Frederick (Maryland) | 1,473.79 mi (2,371.84 km) |
| Boulder to Fredericksburg (Texas) | 763.95 mi (1,229.47 km) |
| Boulder to Fredericksburg (Virginia) | 1,486.19 mi (2,391.79 km) |
| Boulder to Frederickson (Washington) | 982.91 mi (1,581.84 km) |
| Boulder to Freeport (Illinois) | 826.13 mi (1,329.54 km) |
| Boulder to Freeport (New York) | 1,659.28 mi (2,670.35 km) |
| Boulder to Freeport (Texas) | 949.09 mi (1,527.41 km) |
| Boulder to Fremont (California) | 916.21 mi (1,474.49 km) |
| Boulder to Fremont (Nebraska) | 468.98 mi (754.75 km) |
| Boulder to Fremont (Ohio) | 1,160.27 mi (1,867.27 km) |
| Boulder to French Valley (California) | 790.76 mi (1,272.61 km) |
| Boulder to Fresno (California) | 817.51 mi (1,315.66 km) |
| Boulder to Fresno (Texas) | 911.64 mi (1,467.14 km) |
| Boulder to Fridley (Minnesota) | 702.35 mi (1,130.33 km) |
| Boulder to Friendly (Maryland) | 1,506.67 mi (2,424.75 km) |
