| Merthyr Tudful to Lemay (Missouri) | 4,075.24 mi (6,558.47 km) |
| Merthyr Tudful to Lemon Grove (California) | 5,358.12 mi (8,623.06 km) |
| Merthyr Tudful to Lemon Hill (California) | 5,173.17 mi (8,325.41 km) |
| Merthyr Tudful to Lemont (Illinois) | 3,838.86 mi (6,178.05 km) |
| Merthyr Tudful to Lemoore (California) | 5,247.67 mi (8,445.30 km) |
| Merthyr Tudful to Lenexa (Kansas) | 4,228.35 mi (6,804.88 km) |
| Merthyr Tudful to Lennox (California) | 5,334.39 mi (8,584.87 km) |
| Merthyr Tudful to Lenoir (North Carolina) | 3,848.33 mi (6,193.30 km) |
| Merthyr Tudful to Leominster (Massachusetts) | 3,155.67 mi (5,078.56 km) |
| Merthyr Tudful to Leon Valley (Texas) | 4,855.85 mi (7,814.73 km) |
| Merthyr Tudful to Levelland (Texas) | 4,786.97 mi (7,703.89 km) |
| Merthyr Tudful to Levittown (New York) | 3,302.42 mi (5,314.73 km) |
| Merthyr Tudful to Levittown (Pennsylvania) | 3,382.14 mi (5,443.02 km) |
| Merthyr Tudful to Lewisburg (Tennessee) | 4,084.47 mi (6,573.31 km) |
| Merthyr Tudful to Lewiston (Idaho) | 4,600.05 mi (7,403.06 km) |
