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WASHINGTON, D.C. — Six of the country’s 10 counties with the largest population gains this decade — Harris, Tarrant, Bexar, Dallas, Collin, and Travis — were in Texas, according to the U.S. Census Bureau’s July 1, 2019 population estimates, which were released in late March. The remaining four counties on the list are Maricopa County, Arizona; King County, Washington; Clark County, Nevada; and Riverside County, California. In addition, the metropolitan areas of Dallas and Houston ranked No.1 and 2, respectively, in numeric growth among major cities between 2010 and 2019, adding a combined 2.3 million people.