| Difficult Run to Beeville (Texas) | 1,374.51 mi (2,212.06 km) |
| Difficult Run to Bel Air (Maryland) | 69.18 mi (111.33 km) |
| Difficult Run to Bel Air North (Maryland) | 68.93 mi (110.92 km) |
| Difficult Run to Bel Air South (Maryland) | 69.26 mi (111.47 km) |
| Difficult Run to Belgrade (Montana) | 1,777.03 mi (2,859.86 km) |
| Difficult Run to Bell (California) | 2,275.83 mi (3,662.60 km) |
| Difficult Run to Bell Gardens (California) | 2,274.84 mi (3,661.00 km) |
| Difficult Run to Bella Vista (Arkansas) | 939.12 mi (1,511.36 km) |
| Difficult Run to Bellair-Meadowbrook Terrace (Florida) | 652.15 mi (1,049.53 km) |
| Difficult Run to Bellaire (Texas) | 1,210.17 mi (1,947.58 km) |
| Difficult Run to Belle Chasse (Louisiana) | 953.05 mi (1,533.79 km) |
| Difficult Run to Belle Glade (Florida) | 865.18 mi (1,392.37 km) |
| Difficult Run to Bellefontaine (Ohio) | 355.92 mi (572.80 km) |
| Difficult Run to Bellefontaine Neighbors (Missouri) | 692.83 mi (1,115.01 km) |
| Difficult Run to Belleville (Illinois) | 681.62 mi (1,096.97 km) |
