| Rio Grande City to Commerce (California) | 1,265.88 mi (2,037.24 km) |
| Rio Grande City to Commerce City (Colorado) | 993.98 mi (1,599.65 km) |
| Rio Grande City to Compton (California) | 1,267.63 mi (2,040.05 km) |
| Rio Grande City to Comstock Park (Michigan) | 1,368.34 mi (2,202.13 km) |
| Rio Grande City to Concord (California) | 1,567.84 mi (2,523.20 km) |
| Rio Grande City to Concord (Missouri) | 971.56 mi (1,563.58 km) |
| Rio Grande City to Concord (New Hampshire) | 1,920.94 mi (3,091.45 km) |
| Rio Grande City to Concord (North Carolina) | 1,242.10 mi (1,998.96 km) |
| Rio Grande City to Conneaut (Ohio) | 1,491.35 mi (2,400.10 km) |
| Rio Grande City to Connersville (Indiana) | 1,209.32 mi (1,946.21 km) |
| Rio Grande City to Conroe (Texas) | 339.72 mi (546.73 km) |
| Rio Grande City to Converse (Texas) | 218.40 mi (351.48 km) |
| Rio Grande City to Conway (Arkansas) | 708.96 mi (1,140.95 km) |
| Rio Grande City to Conway (Florida) | 1,081.42 mi (1,740.37 km) |
| Rio Grande City to Conway (South Carolina) | 1,286.71 mi (2,070.75 km) |
