| Difficult Run to Baraboo (Wisconsin) | 716.44 mi (1,153.00 km) |
| Difficult Run to Barberton (Ohio) | 268.34 mi (431.86 km) |
| Difficult Run to Bardstown (Kentucky) | 445.45 mi (716.89 km) |
| Difficult Run to Barrington (Illinois) | 608.55 mi (979.36 km) |
| Difficult Run to Barstow (California) | 2,194.28 mi (3,531.36 km) |
| Difficult Run to Bartlesville (Oklahoma) | 1,024.24 mi (1,648.35 km) |
| Difficult Run to Bartlett (Illinois) | 608.87 mi (979.87 km) |
| Difficult Run to Bartlett (Tennessee) | 732.07 mi (1,178.15 km) |
| Difficult Run to Bartow (Florida) | 803.32 mi (1,292.83 km) |
| Difficult Run to Batavia (Illinois) | 611.41 mi (983.97 km) |
| Difficult Run to Batavia (New York) | 286.40 mi (460.91 km) |
| Difficult Run to Batesville (Arkansas) | 812.59 mi (1,307.74 km) |
| Difficult Run to Baton Rouge (Louisiana) | 975.43 mi (1,569.80 km) |
| Difficult Run to Battle Creek (Michigan) | 475.19 mi (764.75 km) |
| Difficult Run to Battle Ground (Washington) | 2,324.33 mi (3,740.65 km) |
