In a Return to Normalcy in one of the first chapters they break the results down by region. I think its pretty much fine with the modern definition of the regions but I know for a while the Dakotahs and MO KY and WV were considered in the midwest and some people consider PA in the midwest.
Biden Wins the North East by 58.7-39.%
Biden wins the industrial Midwest by 49.6-48.5% a margin of 331k votes
Biden Wins the Pacific West by 61.6-35.9%Trump Wins the Greater South by 53.6-44.9% (5 Million votes)
Trump Wins the Inner West and Great Plains by 51.3-46% (821k Votes)