| Difficult Run to Willow Grove (Pennsylvania) | 146.70 mi (236.10 km) |
| Difficult Run to Willowbrook (California) | 2,280.27 mi (3,669.74 km) |
| Difficult Run to Willowick (Ohio) | 287.76 mi (463.10 km) |
| Difficult Run to Wilmette (Illinois) | 587.47 mi (945.44 km) |
| Difficult Run to Wilmington (Delaware) | 112.61 mi (181.22 km) |
| Difficult Run to Wilmington (North Carolina) | 325.54 mi (523.91 km) |
| Difficult Run to Wilmington (Ohio) | 348.31 mi (560.54 km) |
| Difficult Run to Wilmington Island (Georgia) | 518.40 mi (834.28 km) |
| Difficult Run to Wilson (North Carolina) | 221.38 mi (356.27 km) |
| Difficult Run to Wilsonville (Oregon) | 2,338.21 mi (3,762.99 km) |
| Difficult Run to Wilton Manors (Florida) | 895.17 mi (1,440.64 km) |
| Difficult Run to Wimauma (Florida) | 825.05 mi (1,327.78 km) |
| Difficult Run to Winchester (Kentucky) | 375.39 mi (604.14 km) |
| Difficult Run to Winchester (Nevada) | 2,064.95 mi (3,323.22 km) |
| Difficult Run to Winchester (Virginia) | 48.22 mi (77.60 km) |
