An informal survey shows there are 38,000 fundamentalist Mormons in the U.S., Canada and Mexico — up by 1,000.

“It is a conservative figure but that’s the approximate figure for now,” said Anne Wilde, a co-founder of the advocacy group Principle Voices, which conducts the periodic survey. Estimates for organized groups are provided by group leaders or council members. The count includes children and adults, living in both monogamous and polygamous families. Wilde said about half are in plural families.

“It’s been kind of generally increasing but not in thousands, maybe in 50s or 100s,” Wilde said. “There is the birth rate, there is some conversion rate in some of the groups, there is the death rate and some people leave. You’ve got to consider all that and take it into account but you are increasing in numbers.”

Wilde released the survey Friday at a legal conference sponsored by Principle Voices, a nonprofit organization.

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