At long last, here is the complete national precinct map, including estimates for unallocated absentee and early votes.
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Here is the national swing map, applying the same methodology to the 2016 unallocated absentee vote.
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Note that most of KY did not report precinct results this cycle due to changes in their voting process. Similarly, most of NJ only reported township results in 2020 due to using all-mail voting.
A few areas that immediately stood out when looking at the swing map are the Rio Grande Valley and Trans-Pecos region in Texas, as well as the Atlanta suburbs.