Longest Streak of Bellwether Counties?

[electionsguy259]

Hey guys

Happy to join the forum, I've seen a lot of really interesting election analyses on here.

For this forum, my main question is about bellwether counties. I know that Clallam County, Washington has been the nation's most reliable bellwether county since 2020, and prior to that was Valencia County, New Mexico. Does anyone know which county held the longest streak prior to Valencia County? I can only find Okanogan County, Washington, whose streak began in 1904 and ended in 1996 when the county voted for Bob Dole.