| Castle Rock to Frederick (Maryland) | 1,459.20 mi (2,348.35 km) |
| Castle Rock to Fredericksburg (Texas) | 714.55 mi (1,149.96 km) |
| Castle Rock to Fredericksburg (Virginia) | 1,469.06 mi (2,364.22 km) |
| Castle Rock to Frederickson (Washington) | 1,026.49 mi (1,651.97 km) |
| Castle Rock to Freeport (Illinois) | 819.42 mi (1,318.73 km) |
| Castle Rock to Freeport (New York) | 1,648.28 mi (2,652.66 km) |
| Castle Rock to Freeport (Texas) | 901.03 mi (1,450.07 km) |
| Castle Rock to Fremont (California) | 934.26 mi (1,503.55 km) |
| Castle Rock to Fremont (Nebraska) | 462.43 mi (744.22 km) |
| Castle Rock to Fremont (Ohio) | 1,149.50 mi (1,849.93 km) |
| Castle Rock to French Valley (California) | 788.00 mi (1,268.16 km) |
| Castle Rock to Fresno (California) | 831.03 mi (1,337.42 km) |
| Castle Rock to Fresno (Texas) | 863.83 mi (1,390.20 km) |
| Castle Rock to Fridley (Minnesota) | 711.20 mi (1,144.56 km) |
| Castle Rock to Friendly (Maryland) | 1,490.73 mi (2,399.10 km) |
