First choose the number of urban areas by typing ‘100’, ‘250’, or ‘all’ – then try to achieve the highest population among that many of the US 50K+ population urban areas (as defined by the US Census Bureau).  Urban areas are typically named after the largest city of the area, I allow the 2nd largest as an option for the few urban areas named after multiple cities. For a handful, the name of the urban area may be a CDP or other unincorporated community.