| Potomac to Brown Deer (Wisconsin) | 629.99 mi (1,013.87 km) |
| Potomac to Brownsburg (Indiana) | 493.46 mi (794.14 km) |
| Potomac to Brownsville (Florida) | 928.51 mi (1,494.30 km) |
| Potomac to Brownsville (Texas) | 1,478.32 mi (2,379.12 km) |
| Potomac to Brownwood (Texas) | 1,322.72 mi (2,128.72 km) |
| Potomac to Brunswick (Georgia) | 594.94 mi (957.47 km) |
| Potomac to Brunswick (Ohio) | 288.90 mi (464.94 km) |
| Potomac to Brushy Creek (Texas) | 1,301.52 mi (2,094.60 km) |
| Potomac to Bryan (Texas) | 1,227.93 mi (1,976.16 km) |
| Potomac to Bryant (Arkansas) | 897.71 mi (1,444.72 km) |
| Potomac to Bryn Mawr-Skyway (Washington) | 2,306.62 mi (3,712.15 km) |
| Potomac to Buckeye (Arizona) | 2,000.10 mi (3,218.86 km) |
| Potomac to Buckhall (Virginia) | 24.24 mi (39.01 km) |
| Potomac to Bucyrus (Ohio) | 330.19 mi (531.38 km) |
| Potomac to Buda (Texas) | 1,323.43 mi (2,129.85 km) |
