| Merthyr Tudful to Pell City (Alabama) | 4,154.85 mi (6,686.59 km) |
| Merthyr Tudful to Pella (Iowa) | 4,039.33 mi (6,500.68 km) |
| Merthyr Tudful to Pembroke Pines (Florida) | 4,281.69 mi (6,890.72 km) |
| Merthyr Tudful to Pendleton (Oregon) | 4,692.83 mi (7,552.38 km) |
| Merthyr Tudful to Pensacola (Florida) | 4,346.71 mi (6,995.35 km) |
| Merthyr Tudful to Peoria (Arizona) | 5,137.04 mi (8,267.27 km) |
| Merthyr Tudful to Peoria (Illinois) | 3,944.28 mi (6,347.70 km) |
| Merthyr Tudful to Perris (California) | 5,305.05 mi (8,537.65 km) |
| Merthyr Tudful to Perry (Georgia) | 4,103.64 mi (6,604.18 km) |
| Merthyr Tudful to Perry Hall (Maryland) | 3,481.57 mi (5,603.04 km) |
| Merthyr Tudful to Perrysburg (Ohio) | 3,675.45 mi (5,915.07 km) |
| Merthyr Tudful to Perth Amboy (New Jersey) | 3,342.42 mi (5,379.10 km) |
| Merthyr Tudful to Peru (Indiana) | 3,806.37 mi (6,125.76 km) |
| Merthyr Tudful to Petal (Mississippi) | 4,385.19 mi (7,057.29 km) |
| Merthyr Tudful to Petaluma (California) | 5,224.46 mi (8,407.96 km) |
