| Gaithersburg to Beeville (Texas) | 1,388.01 mi (2,233.79 km) |
| Gaithersburg to Bel Air (Maryland) | 53.96 mi (86.84 km) |
| Gaithersburg to Bel Air North (Maryland) | 53.43 mi (85.99 km) |
| Gaithersburg to Bel Air South (Maryland) | 54.49 mi (87.69 km) |
| Gaithersburg to Belgrade (Montana) | 1,776.34 mi (2,858.75 km) |
| Gaithersburg to Bell (California) | 2,281.84 mi (3,672.26 km) |
| Gaithersburg to Bell Gardens (California) | 2,280.85 mi (3,670.68 km) |
| Gaithersburg to Bella Vista (Arkansas) | 947.80 mi (1,525.34 km) |
| Gaithersburg to Bellair-Meadowbrook Terrace (Florida) | 669.78 mi (1,077.91 km) |
| Gaithersburg to Bellaire (Texas) | 1,223.77 mi (1,969.46 km) |
| Gaithersburg to Belle Chasse (Louisiana) | 968.54 mi (1,558.71 km) |
| Gaithersburg to Belle Glade (Florida) | 882.54 mi (1,420.31 km) |
| Gaithersburg to Bellefontaine (Ohio) | 358.05 mi (576.23 km) |
| Gaithersburg to Bellefontaine Neighbors (Missouri) | 699.30 mi (1,125.41 km) |
| Gaithersburg to Belleville (Illinois) | 688.51 mi (1,108.04 km) |
