Github user Tony McGovern has compiled and made available 2020/2016/2012 presidential election results for most of 3000+ U.S. counties, except Alaska. (Image: Wikimedia Commons)
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An aggregated version of the county data after being combined with aggregated versions of the following:
- 2013 county-level demographics from the
df_county_demographicsdata set within thechoroplethrR package - historical voting trends in the state in which the county falls. red = consistently Republican, blue = consistently Democratic, purple = something in between (from https://www.270towin.com/content/blue-and-red-states)