| Merthyr Tudful to Florence (South Carolina) | 3,858.33 mi (6,209.39 km) |
| Merthyr Tudful to Florence-Graham (California) | 5,328.93 mi (8,576.08 km) |
| Merthyr Tudful to Florham Park (New Jersey) | 3,336.43 mi (5,369.46 km) |
| Merthyr Tudful to Florida (Puerto Rico) | 4,088.16 mi (6,579.26 km) |
| Merthyr Tudful to Florida City (Florida) | 4,316.08 mi (6,946.05 km) |
| Merthyr Tudful to Florida Ridge (Florida) | 4,204.96 mi (6,767.23 km) |
| Merthyr Tudful to Florin (California) | 5,173.48 mi (8,325.91 km) |
| Merthyr Tudful to Florissant (Missouri) | 4,064.13 mi (6,540.58 km) |
| Merthyr Tudful to Flower Hill (Maryland) | 3,521.07 mi (5,666.61 km) |
| Merthyr Tudful to Flower Mound (Texas) | 4,614.16 mi (7,425.77 km) |
| Merthyr Tudful to Flowing Wells (Arizona) | 5,173.18 mi (8,325.42 km) |
| Merthyr Tudful to Foley (Alabama) | 4,368.36 mi (7,030.19 km) |
| Merthyr Tudful to Folsom (California) | 5,155.00 mi (8,296.18 km) |
| Merthyr Tudful to Fond du Lac (Wisconsin) | 3,760.69 mi (6,052.24 km) |
| Merthyr Tudful to Fontana (California) | 5,295.68 mi (8,522.57 km) |
