| Rio Grande City to Pelham (Alabama) | 866.19 mi (1,393.99 km) |
| Rio Grande City to Pell City (Alabama) | 899.30 mi (1,447.29 km) |
| Rio Grande City to Pella (Iowa) | 1,091.17 mi (1,756.06 km) |
| Rio Grande City to Pembroke Pines (Florida) | 1,145.20 mi (1,843.02 km) |
| Rio Grande City to Pendleton (Oregon) | 1,729.41 mi (2,783.22 km) |
| Rio Grande City to Pensacola (Florida) | 759.93 mi (1,222.98 km) |
| Rio Grande City to Peoria (Arizona) | 953.08 mi (1,533.83 km) |
| Rio Grande City to Peoria (Illinois) | 1,123.94 mi (1,808.81 km) |
| Rio Grande City to Perris (California) | 1,210.94 mi (1,948.81 km) |
| Rio Grande City to Perry (Georgia) | 999.73 mi (1,608.91 km) |
| Rio Grande City to Perry Hall (Maryland) | 1,570.87 mi (2,528.07 km) |
| Rio Grande City to Perrysburg (Ohio) | 1,357.08 mi (2,184.01 km) |
| Rio Grande City to Perth Amboy (New Jersey) | 1,710.05 mi (2,752.05 km) |
| Rio Grande City to Peru (Indiana) | 1,232.12 mi (1,982.90 km) |
| Rio Grande City to Petal (Mississippi) | 673.51 mi (1,083.90 km) |
