USA 2020 election results by counties

MIT election night 2020

https://github.com/MEDSL/election_night2020

2020 results by counties

https://github.com/tonmcg/US_County_Level_Election_Results_08-20/blob/master/2020_US_County_Level_Presidential_Results.csv

https://github.com/openelections

2004, 2008, 2012 

https://github.com/helloworlddata/us-presidential-election-county-results