| Difficult Run to Exeter (California) | 2,275.32 mi (3,661.77 km) |
| Difficult Run to Fair Lawn (New Jersey) | 221.43 mi (356.35 km) |
| Difficult Run to Fair Oaks (California) | 2,341.42 mi (3,768.15 km) |
| Difficult Run to Fair Oaks (Virginia) | 2.58 mi (4.16 km) |
| Difficult Run to Fairbanks (Alaska) | 3,258.73 mi (5,244.42 km) |
| Difficult Run to Fairborn (Ohio) | 361.25 mi (581.37 km) |
| Difficult Run to Fairburn (Georgia) | 547.17 mi (880.58 km) |
| Difficult Run to Fairfax (Virginia) | 4.21 mi (6.78 km) |
| Difficult Run to Fairfax Station (Virginia) | 7.45 mi (11.98 km) |
| Difficult Run to Fairfield (California) | 2,389.40 mi (3,845.36 km) |
| Difficult Run to Fairfield (Ohio) | 386.67 mi (622.29 km) |
| Difficult Run to Fairhope (Alabama) | 831.50 mi (1,338.16 km) |
| Difficult Run to Fairland (Maryland) | 24.52 mi (39.46 km) |
| Difficult Run to Fairmont (Minnesota) | 945.10 mi (1,520.99 km) |
| Difficult Run to Fairmont (West Virginia) | 155.22 mi (249.80 km) |
