| Merthyr Tudful to Firestone (Colorado) | 4,539.67 mi (7,305.90 km) |
| Merthyr Tudful to Fish Hawk (Florida) | 4,268.75 mi (6,869.88 km) |
| Merthyr Tudful to Fishers (Indiana) | 3,838.85 mi (6,178.03 km) |
| Merthyr Tudful to Fitchburg (Massachusetts) | 3,154.59 mi (5,076.82 km) |
| Merthyr Tudful to Fitchburg (Wisconsin) | 3,833.68 mi (6,169.72 km) |
| Merthyr Tudful to Five Corners (Washington) | 4,799.11 mi (7,723.42 km) |
| Merthyr Tudful to Five Forks (South Carolina) | 3,929.30 mi (6,323.60 km) |
| Merthyr Tudful to Flagstaff (Arizona) | 5,036.69 mi (8,105.77 km) |
| Merthyr Tudful to Flat Rock (Michigan) | 3,635.90 mi (5,851.41 km) |
| Merthyr Tudful to Fleming Island (Florida) | 4,135.94 mi (6,656.16 km) |
| Merthyr Tudful to Flint (Michigan) | 3,611.56 mi (5,812.25 km) |
| Merthyr Tudful to Floral Park (New York) | 3,310.32 mi (5,327.44 km) |
| Merthyr Tudful to Florence (Alabama) | 4,149.81 mi (6,678.47 km) |
| Merthyr Tudful to Florence (Arizona) | 5,145.89 mi (8,281.52 km) |
| Merthyr Tudful to Florence (Kentucky) | 3,831.27 mi (6,165.84 km) |
