| Difficult Run to Ayr | 3,425.75 mi (5,513.22 km) |
| Difficult Run to Bacup | 3,549.68 mi (5,712.66 km) |
| Difficult Run to Baguley | 3,552.36 mi (5,716.98 km) |
| Difficult Run to Baildon | 3,564.06 mi (5,735.79 km) |
| Difficult Run to Bailleston | 3,439.46 mi (5,535.27 km) |
| Difficult Run to Balderton | 3,618.73 mi (5,823.79 km) |
| Difficult Run to Baldock | 3,664.43 mi (5,897.33 km) |
| Difficult Run to Balham | 3,677.92 mi (5,919.03 km) |
| Difficult Run to Bamber Bridge | 3,531.05 mi (5,682.68 km) |
| Difficult Run to Banbridge | 3,379.09 mi (5,438.12 km) |
| Difficult Run to Banbury | 3,616.55 mi (5,820.28 km) |
| Difficult Run to Bangor | 3,397.50 mi (5,467.75 km) |
| Difficult Run to Bangor | 3,481.74 mi (5,603.32 km) |
| Difficult Run to Banstead | 3,678.50 mi (5,919.98 km) |
| Difficult Run to Bargoed | 3,546.38 mi (5,707.34 km) |
