| Rio Grande City to Pottstown (Pennsylvania) | 1,637.54 mi (2,635.37 km) |
| Rio Grande City to Pottsville (Pennsylvania) | 1,626.34 mi (2,617.34 km) |
| Rio Grande City to Poughkeepsie (New York) | 1,764.42 mi (2,839.56 km) |
| Rio Grande City to Poulsbo (Washington) | 1,959.40 mi (3,153.34 km) |
| Rio Grande City to Poway (California) | 1,181.77 mi (1,901.87 km) |
| Rio Grande City to Powder Springs (Georgia) | 989.11 mi (1,591.82 km) |
| Rio Grande City to Powell (Ohio) | 1,312.77 mi (2,112.70 km) |
| Rio Grande City to Powell (Tennessee) | 1,097.34 mi (1,766.00 km) |
| Rio Grande City to Prairie Ridge (Washington) | 1,914.85 mi (3,081.65 km) |
| Rio Grande City to Prairie Village (Kansas) | 904.10 mi (1,455.00 km) |
| Rio Grande City to Prairieville (Louisiana) | 549.85 mi (884.90 km) |
| Rio Grande City to Prattville (Alabama) | 853.57 mi (1,373.69 km) |
| Rio Grande City to Preakness (New Jersey) | 1,725.67 mi (2,777.20 km) |
| Rio Grande City to Prescott (Arizona) | 988.16 mi (1,590.29 km) |
| Rio Grande City to Prescott Valley (Arizona) | 982.39 mi (1,581.00 km) |
