| Round Rock to Beeville (Texas) | 146.68 mi (236.07 km) |
| Round Rock to Bel Air (Maryland) | 1,352.42 mi (2,176.52 km) |
| Round Rock to Bel Air North (Maryland) | 1,351.55 mi (2,175.11 km) |
| Round Rock to Bel Air South (Maryland) | 1,353.36 mi (2,178.01 km) |
| Round Rock to Belgrade (Montana) | 1,280.31 mi (2,060.46 km) |
| Round Rock to Bell (California) | 1,220.08 mi (1,963.53 km) |
| Round Rock to Bell Gardens (California) | 1,218.57 mi (1,961.10 km) |
| Round Rock to Bella Vista (Arkansas) | 454.50 mi (731.45 km) |
| Round Rock to Bellair-Meadowbrook Terrace (Florida) | 949.10 mi (1,527.43 km) |
| Round Rock to Bellaire (Texas) | 143.37 mi (230.73 km) |
| Round Rock to Belle Chasse (Louisiana) | 459.70 mi (739.81 km) |
| Round Rock to Belle Glade (Florida) | 1,063.40 mi (1,711.38 km) |
| Round Rock to Bellefontaine (Ohio) | 1,034.07 mi (1,664.17 km) |
| Round Rock to Bellefontaine Neighbors (Missouri) | 707.73 mi (1,138.99 km) |
| Round Rock to Belleville (Illinois) | 703.37 mi (1,131.97 km) |
