If we take the number of people that admit to skinny dipping as a repetitive number of the population in general, then 25% of the population could be nudists.

There is a story from National Geographic from July 21, 2004 that cites this statistic.

The Skinny on Nudism in the U.S.
Jennifer Hile
National Geographic Channel
July 21, 2004

A recent national Roper poll, one of the two largest independent polling companies in the U.S., said 80 percent of the U.S. public agrees that it is okay to have a nude beach, as long as it is marked by a sign. 25 percent of adults polled said they'd gone skinny-dipping in mixed company at least once in their life.

https://news.nationalgeographic.com/news/2004/07/0721_040721_tvnude_2.html
The Skinny on Nudism in the U.S.

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