densely-populated "Population Density" "Mapping L.A." about average about average "Population Density" densely-populated "Population Density" "Population Density" densely populated neighborhoods in Los Angeles densely-populated in Los Angeles County than in any other area in the city or county densely populated neighborhoods in Los Angeles "Population Density" about average "Population Density" LA’s most densely populated about average about average about average about average among the highest densities "Population Density" "Population Density"