| Rio Grande City to Rockville (Maryland) | 1,528.36 mi (2,459.66 km) |
| Rio Grande City to Rockville Centre (New York) | 1,744.22 mi (2,807.04 km) |
| Rio Grande City to Rockwall (Texas) | 473.70 mi (762.35 km) |
| Rio Grande City to Rocky Mount (North Carolina) | 1,403.67 mi (2,258.99 km) |
| Rio Grande City to Rocky Point (New York) | 1,785.44 mi (2,873.38 km) |
| Rio Grande City to Rocky River (Ohio) | 1,420.66 mi (2,286.34 km) |
| Rio Grande City to Roessleville (New York) | 1,804.34 mi (2,903.80 km) |
| Rio Grande City to Rogers (Arkansas) | 739.45 mi (1,190.03 km) |
| Rio Grande City to Rogers (Minnesota) | 1,331.41 mi (2,142.70 km) |
| Rio Grande City to Rohnert Park (California) | 1,612.87 mi (2,595.66 km) |
| Rio Grande City to Rolla (Missouri) | 898.74 mi (1,446.39 km) |
| Rio Grande City to Rolling Meadows (Illinois) | 1,245.04 mi (2,003.70 km) |
| Rio Grande City to Roma (Texas) | 11.69 mi (18.81 km) |
| Rio Grande City to Rome (Georgia) | 977.36 mi (1,572.91 km) |
| Rio Grande City to Rome (New York) | 1,751.44 mi (2,818.68 km) |
