About a third of counties voted more Democratic. Joseph R. Biden Jr. did well in Pinellas, home to St. Petersburg, which twice supported Barack Obama for president before voting for Mr. Trump in 2016. Mr. Biden flipped a large county — Duval, home of Jacksonville — which Mr. Trump won by a slight margin in 2016.
Mr. Biden’s gains, however, were not enough to make up for votes he lost in populous Miami-Dade County, relative to Hillary Clinton’s returns four years ago.
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