| Difficult Run to Waimea (Hawaii) | 4,746.47 mi (7,638.70 km) |
| Difficult Run to Waipahu (Hawaii) | 4,817.39 mi (7,752.84 km) |
| Difficult Run to Waipio (Hawaii) | 4,815.55 mi (7,749.88 km) |
| Difficult Run to Wake Forest (North Carolina) | 212.87 mi (342.59 km) |
| Difficult Run to Wakefield (Virginia) | 7.89 mi (12.70 km) |
| Difficult Run to Waldorf (Maryland) | 30.68 mi (49.37 km) |
| Difficult Run to Walker (Michigan) | 520.84 mi (838.21 km) |
| Difficult Run to Walker Mill (Maryland) | 24.89 mi (40.06 km) |
| Difficult Run to Walla Walla (Washington) | 2,121.49 mi (3,414.21 km) |
| Difficult Run to Wallingford Center (Connecticut) | 296.83 mi (477.69 km) |
| Difficult Run to Wallington (New Jersey) | 218.39 mi (351.47 km) |
| Difficult Run to Walnut (California) | 2,257.35 mi (3,632.86 km) |
| Difficult Run to Walnut Creek (California) | 2,396.35 mi (3,856.56 km) |
| Difficult Run to Walnut Park (California) | 2,278.39 mi (3,666.71 km) |
| Difficult Run to Waltham (Massachusetts) | 400.43 mi (644.43 km) |
