| Merthyr Tudful to Lewiston (Maine) | 3,026.97 mi (4,871.44 km) |
| Merthyr Tudful to Lewisville (North Carolina) | 3,793.71 mi (6,105.38 km) |
| Merthyr Tudful to Lewisville (Texas) | 4,608.40 mi (7,416.51 km) |
| Merthyr Tudful to Lexington (Kentucky) | 3,867.73 mi (6,224.51 km) |
| Merthyr Tudful to Lexington (Nebraska) | 4,322.31 mi (6,956.08 km) |
| Merthyr Tudful to Lexington (North Carolina) | 3,801.67 mi (6,118.19 km) |
| Merthyr Tudful to Lexington (South Carolina) | 3,926.69 mi (6,319.39 km) |
| Merthyr Tudful to Lexington Park (Maryland) | 3,531.45 mi (5,683.32 km) |
| Merthyr Tudful to Liberal (Kansas) | 4,554.11 mi (7,329.12 km) |
| Merthyr Tudful to Liberty (Missouri) | 4,200.24 mi (6,759.63 km) |
| Merthyr Tudful to Liberty Lake (Washington) | 4,534.16 mi (7,297.03 km) |
| Merthyr Tudful to Liberty Triangle (Florida) | 4,207.79 mi (6,771.78 km) |
| Merthyr Tudful to Libertyville (Illinois) | 3,809.96 mi (6,131.54 km) |
| Merthyr Tudful to Lighthouse Point (Florida) | 4,257.73 mi (6,852.16 km) |
| Merthyr Tudful to Lilburn (Georgia) | 4,051.72 mi (6,520.62 km) |
