| Rio Grande City to Reading (Pennsylvania) | 1,627.52 mi (2,619.24 km) |
| Rio Grande City to Red Bank (New Jersey) | 1,714.28 mi (2,758.86 km) |
| Rio Grande City to Red Bank (Tennessee) | 1,002.79 mi (1,613.84 km) |
| Rio Grande City to Red Bluff (California) | 1,646.26 mi (2,649.40 km) |
| Rio Grande City to Red Hill (South Carolina) | 1,287.10 mi (2,071.39 km) |
| Rio Grande City to Red Oak (Texas) | 441.54 mi (710.59 km) |
| Rio Grande City to Red Wing (Minnesota) | 1,304.30 mi (2,099.06 km) |
| Rio Grande City to Redan (Georgia) | 1,011.72 mi (1,628.20 km) |
| Rio Grande City to Redding (California) | 1,665.04 mi (2,679.63 km) |
| Rio Grande City to Redland (Maryland) | 1,530.45 mi (2,463.03 km) |
| Rio Grande City to Redlands (California) | 1,214.47 mi (1,954.50 km) |
| Rio Grande City to Redmond (Oregon) | 1,753.80 mi (2,822.47 km) |
| Rio Grande City to Redmond (Washington) | 1,938.00 mi (3,118.91 km) |
| Rio Grande City to Redondo Beach (California) | 1,274.93 mi (2,051.81 km) |
| Rio Grande City to Redwood City (California) | 1,566.26 mi (2,520.65 km) |
