| Rio Grande City to Carrollwood (Florida) | 1,007.82 mi (1,621.94 km) |
| Rio Grande City to Carson (California) | 1,267.93 mi (2,040.54 km) |
| Rio Grande City to Carson City (Nevada) | 1,496.02 mi (2,407.60 km) |
| Rio Grande City to Carteret (New Jersey) | 1,714.15 mi (2,758.66 km) |
| Rio Grande City to Cartersville (Georgia) | 993.03 mi (1,598.12 km) |
| Rio Grande City to Carthage (Missouri) | 789.35 mi (1,270.34 km) |
| Rio Grande City to Cary (Illinois) | 1,246.94 mi (2,006.75 km) |
| Rio Grande City to Cary (North Carolina) | 1,346.26 mi (2,166.59 km) |
| Rio Grande City to Casa de Oro-Mount Helix (California) | 1,174.26 mi (1,889.79 km) |
| Rio Grande City to Casa Grande (Arizona) | 897.38 mi (1,444.19 km) |
| Rio Grande City to Casas Adobes (Arizona) | 840.86 mi (1,353.23 km) |
| Rio Grande City to Cascades (Virginia) | 1,516.21 mi (2,440.11 km) |
| Rio Grande City to Casper (Wyoming) | 1,213.39 mi (1,952.76 km) |
| Rio Grande City to Casselberry (Florida) | 1,082.80 mi (1,742.60 km) |
| Rio Grande City to Castaic (California) | 1,303.00 mi (2,096.97 km) |
