Dallas, Texas
According to 2020 U.S. Census Bureau data, five counties added at least 300,000 people in the last decade: Harris County, Texas (Houston-The Woodlands-Sugar Land); Maricopa County, Ariz. (Phoenix-Mesa-Chandler); King County, Wash. (Seattle-Tacoma-Bellevue); Clark County, Nev. (Las Vegas-Henderson-Paradise); and Tarrant County, Texas (Dallas-Fort Worth-Arlington).
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