The Church of Jesus Christ of Latter-day Saints (LDS Church) is the largest religious body in the state of Idaho, commanding the allegiance of 24% of the population. After California and Utah, Idaho contains the most Mormons of any US state. By percentage, it ranks second, behind Utah. The church is particularly prominent in the east of the state. The city of Rexburg is home to Brigham Young UniversityâÂÂIdaho.
The LDS Church first came to Idaho in 1855, when Brigham Young sent pioneers to settle the area. Early settlements were in Franklin, Bear Lake Valley, and south-central Idaho. Idaho became a state in 1890, at which time Latter-day Saints comprised one-fifth of the population. Church presidents Harold B. Lee, Ezra Taft Benson, and Howard W. Hunter were all natives of the state.
List of LDS Church adherents in each county as of 2010 according to the Association of Religion Data Archives: Note: Each county adherent count reflects meetinghouse location of congregation and not location of residence. Census count reflects location of residence, which may skew percent of population where adherents reside in a different county than their congregational meetinghouse.
As of December 2025, Idaho had the following stakes:
In addition to these, the Utah Ogden Mission covers parts of southeastern Idaho, and the Washington Spokane Mission covers northern Idaho.
The Idaho Nampa and Idaho Twin Falls missions, which were created on July 1, 2013, were discontinued in 2019.
Following the dedication of the Pocatello Temple in 2021, there are six LDS temples in Idaho. On April 4, 2021, Russell M. Nelson announced that a new temple will be built in Burley. In October of that year, Nelson announced the intent to build a second temple in Rexburg.
Latter-day Saints have had a significant role in establishing and settling communities within the "Mormon Corridor", including the following in Idaho: