| Round Rock to Bixby (Oklahoma) | 388.33 mi (624.95 km) |
| Round Rock to Black Forest (Colorado) | 710.72 mi (1,143.80 km) |
| Round Rock to Blackfoot (Idaho) | 1,190.02 mi (1,915.15 km) |
| Round Rock to Blackhawk (California) | 1,469.31 mi (2,364.63 km) |
| Round Rock to Blacksburg (Virginia) | 1,089.56 mi (1,753.47 km) |
| Round Rock to Blackwells Mills (New Jersey) | 1,462.05 mi (2,352.95 km) |
| Round Rock to Blaine (Minnesota) | 1,040.07 mi (1,673.83 km) |
| Round Rock to Bloomingdale (Florida) | 945.95 mi (1,522.35 km) |
| Round Rock to Bloomingdale (Illinois) | 951.26 mi (1,530.90 km) |
| Round Rock to Bloomington (California) | 1,176.33 mi (1,893.12 km) |
| Round Rock to Bloomington (Illinois) | 842.60 mi (1,356.03 km) |
| Round Rock to Bloomington (Indiana) | 867.61 mi (1,396.29 km) |
| Round Rock to Bloomington (Minnesota) | 1,016.09 mi (1,635.23 km) |
| Round Rock to Bloomsburg (Pennsylvania) | 1,386.35 mi (2,231.12 km) |
| Round Rock to Blue Ash (Ohio) | 962.38 mi (1,548.79 km) |
