| Merthyr Tudful to La Riviera (California) | 5,167.11 mi (8,315.66 km) |
| Merthyr Tudful to La Vergne (Tennessee) | 4,047.79 mi (6,514.30 km) |
| Merthyr Tudful to La Verne (California) | 5,304.63 mi (8,536.98 km) |
| Merthyr Tudful to La Vista (Nebraska) | 4,167.59 mi (6,707.08 km) |
| Merthyr Tudful to Lacey (Washington) | 4,728.64 mi (7,610.01 km) |
| Merthyr Tudful to Lackawanna (New York) | 3,428.81 mi (5,518.14 km) |
| Merthyr Tudful to Laconia (New Hampshire) | 3,100.98 mi (4,990.55 km) |
| Merthyr Tudful to Ladera Ranch (California) | 5,332.55 mi (8,581.91 km) |
| Merthyr Tudful to Ladson (South Carolina) | 3,927.31 mi (6,320.40 km) |
| Merthyr Tudful to Lady Lake (Florida) | 4,203.19 mi (6,764.38 km) |
| Merthyr Tudful to Lafayette (California) | 5,229.10 mi (8,415.42 km) |
| Merthyr Tudful to Lafayette (Colorado) | 4,553.32 mi (7,327.85 km) |
| Merthyr Tudful to Lafayette (Indiana) | 3,853.63 mi (6,201.82 km) |
| Merthyr Tudful to Lafayette (Louisiana) | 4,556.18 mi (7,332.47 km) |
| Merthyr Tudful to LaGrange (Georgia) | 4,130.57 mi (6,647.51 km) |
