| Difficult Run to Beltsville (Maryland) | 24.79 mi (39.89 km) |
| Difficult Run to Belvedere Park (Georgia) | 523.93 mi (843.18 km) |
| Difficult Run to Belvidere (Illinois) | 646.64 mi (1,040.66 km) |
| Difficult Run to Bemidji (Minnesota) | 1,059.88 mi (1,705.72 km) |
| Difficult Run to Benbrook (Texas) | 1,203.46 mi (1,936.78 km) |
| Difficult Run to Bend (Oregon) | 2,275.91 mi (3,662.72 km) |
| Difficult Run to Benicia (California) | 2,399.07 mi (3,860.92 km) |
| Difficult Run to Bensenville (Illinois) | 595.50 mi (958.36 km) |
| Difficult Run to Bensville (Maryland) | 26.82 mi (43.17 km) |
| Difficult Run to Benton (Arkansas) | 892.98 mi (1,437.11 km) |
| Difficult Run to Bentonville (Arkansas) | 939.05 mi (1,511.26 km) |
| Difficult Run to Berea (Kentucky) | 387.36 mi (623.40 km) |
| Difficult Run to Berea (Ohio) | 293.21 mi (471.87 km) |
| Difficult Run to Berea (South Carolina) | 396.33 mi (637.83 km) |
| Difficult Run to Bergenfield (New Jersey) | 225.84 mi (363.45 km) |
