Population statistics and maps (population, density and changes) for approximately 20 000 settlements in the US. For cities Most populated cities are...
For settlements we don't have boundary info (only for top 200 most popular cities), but we have official  area and location information. Size of the circle is proportional with area of the city; color depend of the population.
Population density is in [p/mi²], changes are for period 2010-2015 in %/year. Click on state name to get more details, historical population and position on map.
Or you can search settlement by state..
 Cities and Towns (Incorporated Places and Minor Civil Divisions) 2014, retrieved 02/23/2016
 Area, latitude longitude data, retrieved 02/23/2016