| Rio Grande City to Cullman (Alabama) | 893.96 mi (1,438.68 km) |
| Rio Grande City to Culpeper (Virginia) | 1,468.15 mi (2,362.76 km) |
| Rio Grande City to Culver City (California) | 1,279.34 mi (2,058.91 km) |
| Rio Grande City to Cumberland (Maryland) | 1,474.44 mi (2,372.88 km) |
| Rio Grande City to Cupertino (California) | 1,552.29 mi (2,498.17 km) |
| Rio Grande City to Cutler Bay (Florida) | 1,148.56 mi (1,848.43 km) |
| Rio Grande City to Cutlerville (Michigan) | 1,357.26 mi (2,184.30 km) |
| Rio Grande City to Cuyahoga Falls (Ohio) | 1,419.66 mi (2,284.73 km) |
| Rio Grande City to Cypress (California) | 1,255.68 mi (2,020.81 km) |
| Rio Grande City to Cypress Gardens (Florida) | 1,058.18 mi (1,702.98 km) |
| Rio Grande City to Cypress Lake (Florida) | 1,045.99 mi (1,683.36 km) |
| Rio Grande City to D'Iberville (Mississippi) | 665.38 mi (1,070.82 km) |
| Rio Grande City to Dakota Ridge (Colorado) | 984.41 mi (1,584.26 km) |
| Rio Grande City to Dale City (Virginia) | 1,505.08 mi (2,422.19 km) |
| Rio Grande City to Dallas (Georgia) | 982.73 mi (1,581.55 km) |
