Guess all cities on US route 20. (The longest road in the USA.) 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 east to west along the road. If the county slot is blank, the city is in either multiple or no counties. Places where route 20 merges with interstates or other roads are counted.
While Route 20 passes through Montana, it does not pass through any cities in that state, only towns.
Cities only on Routes 20A in Ohio and Business 20 in Indiana and Illinois are included.