| Rio Grande City to Rosemont (California) | 1,552.88 mi (2,499.11 km) |
| Rio Grande City to Rosemount (Minnesota) | 1,308.65 mi (2,106.07 km) |
| Rio Grande City to Rosenberg (Texas) | 285.13 mi (458.87 km) |
| Rio Grande City to Roseville (California) | 1,557.98 mi (2,507.32 km) |
| Rio Grande City to Roseville (Michigan) | 1,430.36 mi (2,301.95 km) |
| Rio Grande City to Roseville (Minnesota) | 1,325.34 mi (2,132.94 km) |
| Rio Grande City to Rossmoor (California) | 1,257.30 mi (2,023.43 km) |
| Rio Grande City to Rossville (Maryland) | 1,569.31 mi (2,525.57 km) |
| Rio Grande City to Roswell (Georgia) | 1,011.55 mi (1,627.94 km) |
| Rio Grande City to Roswell (New Mexico) | 591.63 mi (952.14 km) |
| Rio Grande City to Round Lake (Illinois) | 1,258.48 mi (2,025.33 km) |
| Rio Grande City to Round Lake Beach (Illinois) | 1,261.24 mi (2,029.76 km) |
| Rio Grande City to Round Rock (Texas) | 294.97 mi (474.70 km) |
| Rio Grande City to Rowland Heights (California) | 1,251.24 mi (2,013.67 km) |
| Rio Grande City to Rowlett (Texas) | 471.63 mi (759.02 km) |
