| Merthyr Tudful to Petersburg (Virginia) | 3,618.06 mi (5,822.71 km) |
| Merthyr Tudful to Pflugerville (Texas) | 4,766.23 mi (7,670.50 km) |
| Merthyr Tudful to Pharr (Texas) | 5,013.52 mi (8,068.49 km) |
| Merthyr Tudful to Phelan (California) | 5,278.54 mi (8,495.00 km) |
| Merthyr Tudful to Phenix City (Alabama) | 4,157.81 mi (6,691.35 km) |
| Merthyr Tudful to Philadelphia (Pennsylvania) | 3,400.00 mi (5,471.78 km) |
| Merthyr Tudful to Phillipsburg (New Jersey) | 3,372.46 mi (5,427.45 km) |
| Merthyr Tudful to Phoenix (Arizona) | 5,141.33 mi (8,274.17 km) |
| Merthyr Tudful to Phoenixville (Pennsylvania) | 3,410.29 mi (5,488.33 km) |
| Merthyr Tudful to Picayune (Mississippi) | 4,443.88 mi (7,151.74 km) |
| Merthyr Tudful to Pickerington (Ohio) | 3,715.02 mi (5,978.74 km) |
| Merthyr Tudful to Pico Rivera (California) | 5,322.54 mi (8,565.80 km) |
| Merthyr Tudful to Piedmont (California) | 5,236.47 mi (8,427.28 km) |
| Merthyr Tudful to Pierre (South Dakota) | 4,165.40 mi (6,703.57 km) |
| Merthyr Tudful to Pike Creek Valley (Delaware) | 3,435.38 mi (5,528.71 km) |
