| Duluth to Fortuna Foothills (Arizona) | 1,523.57 mi (2,451.94 km) |
| Duluth to Foster City (California) | 1,656.35 mi (2,665.64 km) |
| Duluth to Fostoria (Ohio) | 581.50 mi (935.84 km) |
| Duluth to Fountain (Colorado) | 845.18 mi (1,360.19 km) |
| Duluth to Fountain Hills (Arizona) | 1,370.70 mi (2,205.92 km) |
| Duluth to Fountain Inn (South Carolina) | 981.56 mi (1,579.67 km) |
| Duluth to Fountain Valley (California) | 1,621.58 mi (2,609.68 km) |
| Duluth to Fountainebleau (Florida) | 1,588.78 mi (2,556.89 km) |
| Duluth to Four Corners (Oregon) | 1,479.77 mi (2,381.45 km) |
| Duluth to Four Corners (Texas) | 1,196.87 mi (1,926.17 km) |
| Duluth to Four Square Mile (Colorado) | 805.92 mi (1,297.00 km) |
| Duluth to Fox Crossing (Wisconsin) | 250.10 mi (402.50 km) |
| Duluth to Fox Lake (Illinois) | 358.03 mi (576.19 km) |
| Duluth to Framingham (Massachusetts) | 1,061.60 mi (1,708.48 km) |
| Duluth to Franconia (Virginia) | 937.29 mi (1,508.42 km) |
