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Roman Catholic and Presbyterian missionaries first came to Idaho between 1820 and 1840. The Church of Jesus Christ of Latter-Day Saints (Mormon) has been the leading religion in Idaho since 1860; with about a quarter of the population, the

number of Mormons in Idaho is 2nd only to that in Utah. Catholicism predominates north of Boise.

According to 2000 estimates, Idaho has about 311,425 Mormons, 18,745 adherents in the Assemblies of God, and 17,683 United Methodists. There were 130,847 Roman Catholics and an estimated 1,050 Jews.