| Merthyr Tudful to Portage (Michigan) | 3,722.08 mi (5,990.10 km) |
| Merthyr Tudful to Portage (Wisconsin) | 3,809.53 mi (6,130.85 km) |
| Merthyr Tudful to Portales (New Mexico) | 4,793.02 mi (7,713.63 km) |
| Merthyr Tudful to Porterville (California) | 5,236.26 mi (8,426.94 km) |
| Merthyr Tudful to Portland (Maine) | 3,047.57 mi (4,904.59 km) |
| Merthyr Tudful to Portland (Oregon) | 4,809.77 mi (7,740.58 km) |
| Merthyr Tudful to Portland (Tennessee) | 4,019.05 mi (6,468.04 km) |
| Merthyr Tudful to Portland (Texas) | 4,888.43 mi (7,867.17 km) |
| Merthyr Tudful to Portsmouth (New Hampshire) | 3,093.29 mi (4,978.16 km) |
| Merthyr Tudful to Portsmouth (Ohio) | 3,773.92 mi (6,073.54 km) |
| Merthyr Tudful to Portsmouth (Virginia) | 3,591.35 mi (5,779.72 km) |
| Merthyr Tudful to Post Falls (Idaho) | 4,526.53 mi (7,284.74 km) |
| Merthyr Tudful to Potomac (Maryland) | 3,528.39 mi (5,678.39 km) |
| Merthyr Tudful to Potomac Park (California) | 5,273.64 mi (8,487.10 km) |
| Merthyr Tudful to Pottstown (Pennsylvania) | 3,410.39 mi (5,488.49 km) |
