| Rio Grande City to Prichard (Alabama) | 715.73 mi (1,151.86 km) |
| Rio Grande City to Princeton (Florida) | 1,145.06 mi (1,842.80 km) |
| Rio Grande City to Princeton (New Jersey) | 1,686.30 mi (2,713.84 km) |
| Rio Grande City to Princeton (Texas) | 489.71 mi (788.11 km) |
| Rio Grande City to Princeton Meadows (New Jersey) | 1,690.49 mi (2,720.58 km) |
| Rio Grande City to Prineville (Oregon) | 1,742.83 mi (2,804.81 km) |
| Rio Grande City to Prior Lake (Minnesota) | 1,302.24 mi (2,095.75 km) |
| Rio Grande City to Progress (Pennsylvania) | 1,584.13 mi (2,549.42 km) |
| Rio Grande City to Prospect Heights (Illinois) | 1,249.48 mi (2,010.85 km) |
| Rio Grande City to Prosper (Texas) | 488.97 mi (786.92 km) |
| Rio Grande City to Providence (Rhode Island) | 1,883.03 mi (3,030.44 km) |
| Rio Grande City to Provo (Utah) | 1,207.95 mi (1,944.01 km) |
| Rio Grande City to Prunedale (California) | 1,519.04 mi (2,444.66 km) |
| Rio Grande City to Pueblo (Colorado) | 887.78 mi (1,428.75 km) |
| Rio Grande City to Pueblo West (Colorado) | 895.11 mi (1,440.54 km) |
