Counties with the weirdest voting histories

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I found a county that had always voted Democrat ever since the state it belongs to was admitted to the Union. In each presidential election. Without any exception. Literally! Even in GOP tsunami years.
Until 2000, when said county finally turned its back on the Democrats and became more and more Republican. In fact, in the last presidential election it produced its best result for the GOP, in contrast to its very first election where the GOP came a mere distant fourth.

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I am guessing this county was established between the 1908 and 1912 presidential races and 1912 was its first presidential election, based off the fact that the GOP came third in the county in the county's first presidential race. As for location, most likely either in eastern KY or WV. It is also possible though unlikely that this county is in southern TX.

Even though your premise is absolutely correct (kudos for that!), your conclusion, alas, is wrong.

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It could be Greenlee, AZ, then. AZ was after all not made a state until 1912 and 1912 was its first presidential race, so if Greenlee was made at the same time as AZ and wasn't made later on, this would track with the part about the GOP coming in 3rd in 1912. I also know Greenlee was an ancestrally blue county that voted even for McGovern in 1972 (though not entirely sure if it went for Stevenson in 1948 and 1952 and if it was blue prior to the New Deal), but which has not gone blue since 1996.

Greenlee County, Arizona, is the correct answer.
However, I made a mistake, which I've already corrected; Taft was apparently so unpopular that he even fell behind Socialist Debs. lol.

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Greenlee County, Arizona, is the correct answer.
However, I made a mistake, which I've already corrected; Taft was apparently so unpopular that he even fell behind Socialist Debs. lol.

Yes!

👍🏻 👏🏻 🙌🏻

Its 1964 result is even more astonishing in my opinion; while Arizona was the only state beyond the Deep South to vote for Goldwater owing to the favorite-son effect, Greenlee swung so hard to the left that Johnson performed there above average compared with the national result. (73.6% to 61.1%).
Greenlee seems to some kind of little Appalachia, as most inhabitants there earn their keeps by the mining industry, which would somehow explain the county's similar voting history.

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What are some counties that have particularly weird swings/vote histories in presidential elections?

If presidential primaries also count, this county is the unbeatable winner; no other county will ever be able to outdo it when it comes to strange voting behavior.