I was looking into rural counties in blue states that vote Republican. I found one that stuck out: Eureka County. Its citizens cast almost 85% of their votes for Donald Trump. Is this the reddest county within a state carried by Hillary Clinton? Or is there a redder one still, probably in a midwestern state like Colorado?
Also: if Texas turned blue in 2016 due to massive Hispanic turnout, there would be counties in the >90% range that are in a state that votes Democratic.