| Castricum to Fortuna Foothills (Arizona) | 5,502.89 mi (8,856.05 km) |
| Castricum to Foster City (California) | 5,444.54 mi (8,762.13 km) |
| Castricum to Fostoria (Ohio) | 3,970.26 mi (6,389.52 km) |
| Castricum to Fountain (Colorado) | 4,849.30 mi (7,804.20 km) |
| Castricum to Fountain Hills (Arizona) | 5,363.87 mi (8,632.32 km) |
| Castricum to Fountain Inn (South Carolina) | 4,239.81 mi (6,823.31 km) |
| Castricum to Fountain Valley (California) | 5,550.38 mi (8,932.47 km) |
| Castricum to Fountainebleau (Florida) | 4,620.43 mi (7,435.86 km) |
| Castricum to Four Corners (Oregon) | 5,021.49 mi (8,081.31 km) |
| Castricum to Four Corners (Texas) | 5,019.35 mi (8,077.87 km) |
| Castricum to Four Square Mile (Colorado) | 4,801.73 mi (7,727.64 km) |
| Castricum to Fox Crossing (Wisconsin) | 4,007.96 mi (6,450.18 km) |
| Castricum to Fox Lake (Illinois) | 4,084.82 mi (6,573.89 km) |
| Castricum to Framingham (Massachusetts) | 3,456.76 mi (5,563.12 km) |
| Castricum to Franconia (Virginia) | 3,843.73 mi (6,185.89 km) |
