| Rio Grande City to Brown Deer (Wisconsin) | 1,310.80 mi (2,109.53 km) |
| Rio Grande City to Brownsburg (Indiana) | 1,173.11 mi (1,887.93 km) |
| Rio Grande City to Brownsville (Florida) | 1,152.48 mi (1,854.73 km) |
| Rio Grande City to Brownsville (Texas) | 88.59 mi (142.57 km) |
| Rio Grande City to Brownwood (Texas) | 368.52 mi (593.07 km) |
| Rio Grande City to Brunswick (Georgia) | 1,099.59 mi (1,769.61 km) |
| Rio Grande City to Brunswick (Ohio) | 1,411.66 mi (2,271.85 km) |
| Rio Grande City to Brushy Creek (Texas) | 292.97 mi (471.49 km) |
| Rio Grande City to Bryan (Texas) | 330.99 mi (532.68 km) |
| Rio Grande City to Bryant (Arkansas) | 682.04 mi (1,097.64 km) |
| Rio Grande City to Bryn Mawr-Skyway (Washington) | 1,934.17 mi (3,112.74 km) |
| Rio Grande City to Buckeye (Arizona) | 959.18 mi (1,543.65 km) |
| Rio Grande City to Buckhall (Virginia) | 1,502.73 mi (2,418.41 km) |
| Rio Grande City to Bucyrus (Ohio) | 1,346.67 mi (2,167.26 km) |
| Rio Grande City to Buda (Texas) | 262.07 mi (421.77 km) |
