| Merthyr Tudful to Friendswood (Texas) | 4,719.32 mi (7,595.02 km) |
| Merthyr Tudful to Frisco (Texas) | 4,596.52 mi (7,397.39 km) |
| Merthyr Tudful to Front Royal (Virginia) | 3,572.87 mi (5,749.99 km) |
| Merthyr Tudful to Fruit Cove (Florida) | 4,132.04 mi (6,649.88 km) |
| Merthyr Tudful to Fruita (Colorado) | 4,723.56 mi (7,601.84 km) |
| Merthyr Tudful to Fruitville (Florida) | 4,305.07 mi (6,928.33 km) |
| Merthyr Tudful to Fuller Heights (Florida) | 4,255.96 mi (6,849.30 km) |
| Merthyr Tudful to Fullerton (California) | 5,323.19 mi (8,566.85 km) |
| Merthyr Tudful to Fullerton (Pennsylvania) | 3,387.32 mi (5,451.36 km) |
| Merthyr Tudful to Fulshear (Texas) | 4,737.21 mi (7,623.80 km) |
| Merthyr Tudful to Fulton (Missouri) | 4,124.39 mi (6,637.57 km) |
| Merthyr Tudful to Fulton (New York) | 3,311.17 mi (5,328.81 km) |
| Merthyr Tudful to Fuquay-Varina (North Carolina) | 3,749.67 mi (6,034.51 km) |
| Merthyr Tudful to Gadsden (Alabama) | 4,122.83 mi (6,635.06 km) |
| Merthyr Tudful to Gaffney (South Carolina) | 3,893.07 mi (6,265.29 km) |
