nytimes September 3, 2021 5:00pm The Downtown Decade: U.S. Population Density Rose in the 2010s #urbanareas #population #census #twothousandtensdecade #suburbs #losangelescalif #news The Downtown Decade: U.S. Population Density Rose in the 2010s Outer suburbs still grew the fastest, but many downtowns and central districts also grew rapidly.