| Rio Grande City to Petaluma (California) | 1,606.46 mi (2,585.35 km) |
| Rio Grande City to Petersburg (Virginia) | 1,458.69 mi (2,347.54 km) |
| Rio Grande City to Pflugerville (Texas) | 290.85 mi (468.08 km) |
| Rio Grande City to Pharr (Texas) | 41.76 mi (67.21 km) |
| Rio Grande City to Phelan (California) | 1,243.02 mi (2,000.45 km) |
| Rio Grande City to Phenix City (Alabama) | 929.34 mi (1,495.63 km) |
| Rio Grande City to Philadelphia (Pennsylvania) | 1,653.43 mi (2,660.94 km) |
| Rio Grande City to Phillipsburg (New Jersey) | 1,673.44 mi (2,693.13 km) |
| Rio Grande City to Phoenix (Arizona) | 935.46 mi (1,505.48 km) |
| Rio Grande City to Phoenixville (Pennsylvania) | 1,639.52 mi (2,638.56 km) |
| Rio Grande City to Picayune (Mississippi) | 625.10 mi (1,006.00 km) |
| Rio Grande City to Pickerington (Ohio) | 1,312.63 mi (2,112.47 km) |
| Rio Grande City to Pico Rivera (California) | 1,262.33 mi (2,031.53 km) |
| Rio Grande City to Piedmont (California) | 1,575.12 mi (2,534.91 km) |
| Rio Grande City to Pierre (South Dakota) | 1,246.07 mi (2,005.36 km) |
