| Rio Grande City to Sugar Hill (Georgia) | 1,028.76 mi (1,655.62 km) |
| Rio Grande City to Sugar Land (Texas) | 295.01 mi (474.78 km) |
| Rio Grande City to Sugarland Run (Virginia) | 1,516.22 mi (2,440.13 km) |
| Rio Grande City to Sugarmill Woods (Florida) | 1,011.97 mi (1,628.61 km) |
| Rio Grande City to Suisun City (California) | 1,576.01 mi (2,536.35 km) |
| Rio Grande City to Suitland (Maryland) | 1,531.77 mi (2,465.14 km) |
| Rio Grande City to Sulphur (Louisiana) | 425.56 mi (684.87 km) |
| Rio Grande City to Sulphur Springs (Texas) | 505.18 mi (813.01 km) |
| Rio Grande City to Summerfield (Maryland) | 1,536.14 mi (2,472.17 km) |
| Rio Grande City to Summerfield (North Carolina) | 1,303.33 mi (2,097.51 km) |
| Rio Grande City to Summerlin South (Nevada) | 1,182.24 mi (1,902.64 km) |
| Rio Grande City to Summerville (South Carolina) | 1,206.53 mi (1,941.73 km) |
| Rio Grande City to Summit (Illinois) | 1,234.43 mi (1,986.63 km) |
| Rio Grande City to Summit (New Jersey) | 1,711.98 mi (2,755.17 km) |
| Rio Grande City to Sumner (Washington) | 1,921.53 mi (3,092.41 km) |
