Kamala Harris is the sixth Democrat — and the third female U.S. senator — to announce their candidacy for the 2020 presidential campaign. Here is information on declared candidates as of Jan. 21:
Change in County Population, 2017 to 2018
Most of the counties with the highest rates of growth were concentrated in the West and South. Maricopa County in Arizona, home to Phoenix, topped all counties in numeric growth, adding over 81,000 new residents in one year.