| Merthyr Tudful to Pottsville (Pennsylvania) | 3,414.86 mi (5,495.69 km) |
| Merthyr Tudful to Poughkeepsie (New York) | 3,278.00 mi (5,275.43 km) |
| Merthyr Tudful to Poulsbo (Washington) | 4,685.40 mi (7,540.42 km) |
| Merthyr Tudful to Poway (California) | 5,343.35 mi (8,599.29 km) |
| Merthyr Tudful to Powder Springs (Georgia) | 4,075.33 mi (6,558.61 km) |
| Merthyr Tudful to Powell (Ohio) | 3,714.92 mi (5,978.58 km) |
| Merthyr Tudful to Powell (Tennessee) | 3,944.71 mi (6,348.40 km) |
| Merthyr Tudful to Prairie Ridge (Washington) | 4,705.28 mi (7,572.42 km) |
| Merthyr Tudful to Prairie Village (Kansas) | 4,220.77 mi (6,792.67 km) |
| Merthyr Tudful to Prairieville (Louisiana) | 4,507.15 mi (7,253.55 km) |
| Merthyr Tudful to Prattville (Alabama) | 4,216.56 mi (6,785.89 km) |
| Merthyr Tudful to Preakness (New Jersey) | 3,322.52 mi (5,347.08 km) |
| Merthyr Tudful to Prescott (Arizona) | 5,098.32 mi (8,204.96 km) |
| Merthyr Tudful to Prescott Valley (Arizona) | 5,093.14 mi (8,196.61 km) |
| Merthyr Tudful to Prichard (Alabama) | 4,368.70 mi (7,030.75 km) |
