| Rio Grande City to Roy (Utah) | 1,270.07 mi (2,043.98 km) |
| Rio Grande City to Royal Kunia (Hawaii) | 3,724.53 mi (5,994.05 km) |
| Rio Grande City to Royal Oak (Michigan) | 1,422.78 mi (2,289.74 km) |
| Rio Grande City to Royal Palm Beach (Florida) | 1,148.73 mi (1,848.70 km) |
| Rio Grande City to Royse City (Texas) | 479.80 mi (772.16 km) |
| Rio Grande City to Ruskin (Florida) | 1,012.67 mi (1,629.73 km) |
| Rio Grande City to Russellville (Alabama) | 865.99 mi (1,393.67 km) |
| Rio Grande City to Russellville (Arkansas) | 700.68 mi (1,127.63 km) |
| Rio Grande City to Ruston (Louisiana) | 564.67 mi (908.75 km) |
| Rio Grande City to Rutherford (New Jersey) | 1,727.35 mi (2,779.90 km) |
| Rio Grande City to Rutland (Vermont) | 1,872.02 mi (3,012.73 km) |
| Rio Grande City to Sabana Grande (Puerto Rico) | 2,110.29 mi (3,396.18 km) |
| Rio Grande City to Sachse (Texas) | 474.88 mi (764.25 km) |
| Rio Grande City to Saco (Maine) | 1,979.59 mi (3,185.85 km) |
| Rio Grande City to Sacramento (California) | 1,558.98 mi (2,508.93 km) |
