What is the average vote share (percentage) for Donald Trump in counties named Jefferson? Provide an answer rounded to the nearest tenth, without a percent sign.

43.9 percent

Trump’s vote share in Jefferson counties was 43.87 percent of the vote(137,768 votes). When 43.87 is rounded up to the nearest tenth, we consider the hundredth value which is 7 and more than 5 so the tenth value is increased by 1 thereby making it 43.9percent.

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