| Mountain Ash to Fortuna Foothills (Arizona) | 5,274.43 mi (8,488.37 km) |
| Mountain Ash to Foster City (California) | 5,255.81 mi (8,458.40 km) |
| Mountain Ash to Fostoria (Ohio) | 3,684.89 mi (5,930.26 km) |
| Mountain Ash to Fountain (Colorado) | 4,608.44 mi (7,416.56 km) |
| Mountain Ash to Fountain Hills (Arizona) | 5,129.53 mi (8,255.18 km) |
| Mountain Ash to Fountain Inn (South Carolina) | 3,934.45 mi (6,331.89 km) |
| Mountain Ash to Fountain Valley (California) | 5,336.41 mi (8,588.12 km) |
| Mountain Ash to Fountainebleau (Florida) | 4,294.64 mi (6,911.56 km) |
| Mountain Ash to Four Corners (Oregon) | 4,856.38 mi (7,815.60 km) |
| Mountain Ash to Four Corners (Texas) | 4,731.04 mi (7,613.87 km) |
| Mountain Ash to Four Square Mile (Colorado) | 4,564.43 mi (7,345.73 km) |
| Mountain Ash to Fox Crossing (Wisconsin) | 3,743.78 mi (6,025.03 km) |
| Mountain Ash to Fox Lake (Illinois) | 3,813.90 mi (6,137.89 km) |
| Mountain Ash to Framingham (Massachusetts) | 3,151.80 mi (5,072.32 km) |
| Mountain Ash to Franconia (Virginia) | 3,539.03 mi (5,695.52 km) |
