| Rio Grande City to Romeoville (Illinois) | 1,217.32 mi (1,959.09 km) |
| Rio Grande City to Romulus (Michigan) | 1,401.06 mi (2,254.78 km) |
| Rio Grande City to Ronkonkoma (New York) | 1,772.59 mi (2,852.70 km) |
| Rio Grande City to Roosevelt (New York) | 1,747.25 mi (2,811.93 km) |
| Rio Grande City to Rosamond (California) | 1,290.37 mi (2,076.65 km) |
| Rio Grande City to Rosaryville (Maryland) | 1,533.73 mi (2,468.29 km) |
| Rio Grande City to Roscoe (Illinois) | 1,239.65 mi (1,995.02 km) |
| Rio Grande City to Rose Hill (Virginia) | 1,520.91 mi (2,447.67 km) |
| Rio Grande City to Roseburg (Oregon) | 1,801.93 mi (2,899.93 km) |
| Rio Grande City to Rosedale (California) | 1,355.72 mi (2,181.82 km) |
| Rio Grande City to Rosedale (Maryland) | 1,566.82 mi (2,521.56 km) |
| Rio Grande City to Roselle (Illinois) | 1,237.90 mi (1,992.21 km) |
| Rio Grande City to Roselle (New Jersey) | 1,714.84 mi (2,759.76 km) |
| Rio Grande City to Roselle Park (New Jersey) | 1,714.93 mi (2,759.91 km) |
| Rio Grande City to Rosemead (California) | 1,263.80 mi (2,033.89 km) |
