What about some of the random counties in Kentucky that have always been extremely Republican? One that fits that bill I was looking at results on is Jackson County, Kentucky. I'd be curious to know more about it and I'm sure there are people qualified here for that. Since 1916, Republicans only fell below 80% four times (one of those was 79.8% in 1976 and the other three were 1964, 1992 and 1996). Taken another way, Democrats have never hit 30% and only twice hit 20%. It gave Landon 89% of the vote in 1936 and Trump 89% of the vote in 2016. It's easily one of the most Republican counties in the country and always has been (and several times was the most Republican in the nation).
It’s pretty much the same phenomenon as Eastern Tennessee; historically pro-Union in opposition to the lowland elites, now vote as you would expect rural white Appalachian counties to vote (although at the state level in Kentucky, their ancestral Republicanism still shows as they are much more Republican than many of the coal/historically pro-Confederacy counties in NE Kentucky like Elliot.
