Guess all cities on US route 15. Only cities within the USA are counted. Towns, unincorporated areas, and other non-cites are not counted. Below the map, they will be listed with their states and counties in order of north to south along the road. If the county slot is blank, the city is in either multiple or no counties. Places where route 15 merges with interstates or other roads are counted.
While Route 15 passes through New York and Virginia, it does not pass through any cities in those states, only towns.