| Rio Grande City to Carlsbad (California) | 1,199.20 mi (1,929.93 km) |
| Rio Grande City to Carlsbad (New Mexico) | 528.36 mi (850.32 km) |
| Rio Grande City to Carmel (Indiana) | 1,188.22 mi (1,912.26 km) |
| Rio Grande City to Carmichael (California) | 1,554.03 mi (2,500.98 km) |
| Rio Grande City to Carney (Maryland) | 1,568.67 mi (2,524.53 km) |
| Rio Grande City to Carnot-Moon (Pennsylvania) | 1,444.93 mi (2,325.38 km) |
| Rio Grande City to Carol Stream (Illinois) | 1,233.01 mi (1,984.34 km) |
| Rio Grande City to Carolina (Puerto Rico) | 2,162.58 mi (3,480.34 km) |
| Rio Grande City to Carolina Forest (South Carolina) | 1,292.19 mi (2,079.58 km) |
| Rio Grande City to Carpentersville (Illinois) | 1,240.56 mi (1,996.49 km) |
| Rio Grande City to Carpinteria (California) | 1,348.36 mi (2,169.97 km) |
| Rio Grande City to Carrboro (North Carolina) | 1,336.49 mi (2,150.87 km) |
| Rio Grande City to Carroll (Iowa) | 1,106.98 mi (1,781.52 km) |
| Rio Grande City to Carrollton (Georgia) | 959.65 mi (1,544.40 km) |
| Rio Grande City to Carrollton (Texas) | 470.90 mi (757.83 km) |
