Did Wisconsin have more than 40,000 KKK members in the 1920s?

We found no authoritative estimate that the number of Ku Klux Klan members in Wisconsin in the 1920s was 40,000.

That’s the current population of Wausau in central Wisconsin.

“No one knows for sure how many Americans joined during the 1920s but the best estimates are around 2 million members, some 15,000 of whom were in Wisconsin,” according to the Wisconsin Historical Society.