| Rio Grande City to Blue Island (Illinois) | 1,230.88 mi (1,980.90 km) |
| Rio Grande City to Blue Springs (Missouri) | 911.61 mi (1,467.10 km) |
| Rio Grande City to Bluffdale (Utah) | 1,229.99 mi (1,979.47 km) |
| Rio Grande City to Bluffton (Indiana) | 1,262.42 mi (2,031.67 km) |
| Rio Grande City to Bluffton (South Carolina) | 1,149.00 mi (1,849.14 km) |
| Rio Grande City to Blythe (California) | 1,067.74 mi (1,718.36 km) |
| Rio Grande City to Blytheville (Arkansas) | 843.77 mi (1,357.92 km) |
| Rio Grande City to Boca Raton (Florida) | 1,157.33 mi (1,862.54 km) |
| Rio Grande City to Boerne (Texas) | 235.25 mi (378.60 km) |
| Rio Grande City to Bogalusa (Louisiana) | 622.45 mi (1,001.74 km) |
| Rio Grande City to Boiling Springs (South Carolina) | 1,163.46 mi (1,872.40 km) |
| Rio Grande City to Boise (Idaho) | 1,538.18 mi (2,475.47 km) |
| Rio Grande City to Bolingbrook (Illinois) | 1,220.62 mi (1,964.39 km) |
| Rio Grande City to Bolivar (Missouri) | 837.31 mi (1,347.52 km) |
| Rio Grande City to Bon Air (Virginia) | 1,458.99 mi (2,348.01 km) |
