| Merthyr Tudful to Fortuna Foothills (Arizona) | 5,271.97 mi (8,484.41 km) |
| Merthyr Tudful to Foster City (California) | 5,252.87 mi (8,453.67 km) |
| Merthyr Tudful to Fostoria (Ohio) | 3,683.32 mi (5,927.73 km) |
| Merthyr Tudful to Fountain (Colorado) | 4,606.13 mi (7,412.85 km) |
| Merthyr Tudful to Fountain Hills (Arizona) | 5,127.15 mi (8,251.34 km) |
| Merthyr Tudful to Fountain Inn (South Carolina) | 3,933.35 mi (6,330.11 km) |
| Merthyr Tudful to Fountain Valley (California) | 5,333.76 mi (8,583.86 km) |
| Merthyr Tudful to Fountainebleau (Florida) | 4,294.16 mi (6,910.79 km) |
| Merthyr Tudful to Four Corners (Oregon) | 4,853.20 mi (7,810.47 km) |
| Merthyr Tudful to Four Corners (Texas) | 4,729.56 mi (7,611.49 km) |
| Merthyr Tudful to Four Square Mile (Colorado) | 4,562.06 mi (7,341.93 km) |
| Merthyr Tudful to Fox Crossing (Wisconsin) | 3,741.81 mi (6,021.86 km) |
| Merthyr Tudful to Fox Lake (Illinois) | 3,812.06 mi (6,134.91 km) |
| Merthyr Tudful to Framingham (Massachusetts) | 3,150.65 mi (5,070.48 km) |
| Merthyr Tudful to Franconia (Virginia) | 3,537.90 mi (5,693.69 km) |
