| Merthyr Tudful to Lomita (California) | 5,341.21 mi (8,595.85 km) |
| Merthyr Tudful to Lompoc (California) | 5,362.05 mi (8,629.38 km) |
| Merthyr Tudful to London (Ohio) | 3,741.56 mi (6,021.46 km) |
| Merthyr Tudful to Lone Tree (Colorado) | 4,569.21 mi (7,353.43 km) |
| Merthyr Tudful to Long Beach (California) | 5,335.98 mi (8,587.44 km) |
| Merthyr Tudful to Long Beach (Mississippi) | 4,431.77 mi (7,132.25 km) |
| Merthyr Tudful to Long Beach (New York) | 3,314.53 mi (5,334.22 km) |
| Merthyr Tudful to Long Branch (New Jersey) | 3,340.49 mi (5,376.00 km) |
| Merthyr Tudful to Longmont (Colorado) | 4,544.36 mi (7,313.44 km) |
| Merthyr Tudful to Longview (Texas) | 4,548.09 mi (7,319.44 km) |
| Merthyr Tudful to Longview (Washington) | 4,784.05 mi (7,699.19 km) |
| Merthyr Tudful to Longwood (Florida) | 4,189.80 mi (6,742.83 km) |
| Merthyr Tudful to Lorain (Ohio) | 3,622.12 mi (5,829.23 km) |
| Merthyr Tudful to Lorton (Virginia) | 3,543.39 mi (5,702.54 km) |
| Merthyr Tudful to Los Alamitos (California) | 5,332.45 mi (8,581.75 km) |
