Over the years, I have written various articles for Word Ways on the logology of the names of the 50 US states and the 50 state capitals. There have been transposals, transdeletions, transadditions and so on. But I've never explored the names of the US counties.
"US County Names,"
Word Ways: Vol. 44
, Article 27.
Available at: https://digitalcommons.butler.edu/wordways/vol44/iss3/27