| Duffel to Fortuna Foothills (Arizona) | 5,564.65 mi (8,955.43 km) |
| Duffel to Foster City (California) | 5,516.92 mi (8,878.62 km) |
| Duffel to Fostoria (Ohio) | 4,010.31 mi (6,453.97 km) |
| Duffel to Fountain (Colorado) | 4,906.85 mi (7,896.81 km) |
| Duffel to Fountain Hills (Arizona) | 5,423.75 mi (8,728.69 km) |
| Duffel to Fountain Inn (South Carolina) | 4,269.79 mi (6,871.56 km) |
| Duffel to Fountain Valley (California) | 5,616.34 mi (9,038.62 km) |
| Duffel to Fountainebleau (Florida) | 4,636.64 mi (7,461.95 km) |
| Duffel to Four Corners (Oregon) | 5,098.91 mi (8,205.90 km) |
| Duffel to Four Corners (Texas) | 5,058.43 mi (8,140.75 km) |
| Duffel to Four Square Mile (Colorado) | 4,860.40 mi (7,822.05 km) |
| Duffel to Fox Crossing (Wisconsin) | 4,056.84 mi (6,528.86 km) |
| Duffel to Fox Lake (Illinois) | 4,131.11 mi (6,648.38 km) |
| Duffel to Framingham (Massachusetts) | 3,486.71 mi (5,611.31 km) |
| Duffel to Franconia (Virginia) | 3,873.96 mi (6,234.54 km) |
