Mormon Population Trends: Salt Lake City Is Shifting Fast
Salt Lake City's Mormon population is still large in absolute numbers, but its share of the metro area has been declining for years, and Salt Lake County crossed a major symbolic threshold when Latter-day Saints fell below 50% of residents in 2018. That shift reflects both slower church growth and faster diversification from in-migration, especially as Utah's job market has attracted more non-Mormon newcomers.
What the trend means
The key story behind Salt Lake City is not that the church disappeared, but that it no longer dominates the county the way it once did. In Salt Lake County, Mormon membership was reported at 49% in 2018, the lowest share since at least the 1930s, while statewide membership was still around 62% and also gradually drifting downward.
For many residents, that change has been visible in neighborhoods, schools, workplaces, and politics, where religious diversity has increased alongside population growth. Researchers cited in the reporting estimated that only about 40% of all Mormons were active at the time, which would put active Latter-day Saints at roughly one-quarter of Salt Lake County residents.
How the numbers changed
The trajectory is clearer when viewed over time: Salt Lake County was above 51% LDS in 2013, then later slipped to 49% by 2018. That is a substantial move in a short period for a region long associated with the faith, and it shows that demographic change in the county has been faster than in much of the rest of Utah.
Statewide, Utah remained majority-Latter-day Saint, but the long-term pattern was still downward because the state economy was drawing more outside workers, including people with no LDS background. The reporting also noted that 2017 was the slowest year of church membership growth in 80 years, and convert baptisms hit a 30-year low.
| Area | Reported LDS share | Context |
|---|---|---|
| Salt Lake County, 2013 | 51.41% | Still a slim LDS majority |
| Salt Lake County, 2018 | 49% | No longer an LDS majority |
| Utah statewide, 2018 | Nearly 62% | Majority-LDS, but declining |
| Weber County, 2018 | 53% | Nearing parity |
Why it is happening
Two forces stand out: lower religious retention and greater regional diversity. Utah's strong labor market has encouraged more interstate migration, and many of those new residents are not Mormon, which steadily reduces the church's share even when the total population keeps growing.
At the same time, the LDS Church has faced slower worldwide growth than in earlier decades, with lower conversion rates than in the past. That matters in a headquarters city like Salt Lake City because local membership patterns are influenced both by migration into the metro area and by broader church trends.
"Fewer than half the residents of Salt Lake County belong to the Mormon Church" is the headline line that captured the turning point for local observers in 2018.
Local impact
The decline in LDS dominance has changed how Salt Lake City is described politically, culturally, and socially, because the city is now better understood as a pluralistic metro rather than a uniformly Mormon stronghold. That does not erase the church's influence; it simply means influence now coexists with a broader mix of faiths and nonreligious residents.
Salt Lake County is also now one of several Utah counties where Latter-day Saints are not the majority, alongside Carbon, San Juan, Summit, and Grand counties. That makes Salt Lake County the most visible example of how Utah's demographic center is moving from cultural uniformity toward religious diversity.
Historical context
For much of the 20th century, Salt Lake City and Salt Lake County were closely associated with the LDS Church's social and civic identity. The 2018 change therefore carried symbolic weight well beyond the raw percentage, because it represented the first time in modern local reporting that the county had fallen below the 50% mark.
That historical backdrop helps explain why the shift drew national coverage: in a city built around the church's headquarters, even modest changes in percentage can signal a major cultural transition. The trend is especially important in Salt Lake City because the city remains the church's administrative center even as the surrounding population becomes more diverse.
- Salt Lake County crossed from LDS-majority to LDS-minority status in 2018.
- Utah statewide remained majority-LDS, but the share continued to edge downward.
- Migration and slower church growth are the main drivers behind the change.
- The local effect is greater religious diversity and less single-faith dominance.
Recent signals
More recent reporting in 2026 suggests the broader membership story continues to evolve, with one account describing a historic first in which U.S. membership reportedly dipped slightly even as global membership still rose. If those figures hold, they reinforce the idea that Salt Lake City sits at the center of a church whose worldwide footprint is still large, but whose U.S. growth dynamics have become more complicated.
That does not necessarily mean a rapid collapse in local influence, but it does suggest the demographic era of near-total LDS dominance in Salt Lake County is over. The more realistic expectation is continued gradual diversification rather than a dramatic one-year swing.
Everything you need to know about Mormon Population Trends Salt Lake City
What does "Mormon population" mean in Salt Lake County?
In the reporting used here, it refers to Latter-day Saint membership counts supplied by the church, which can include active and nonactive members rather than only regular churchgoers. That is why estimates of active membership are lower than the headline percentage.
Is Salt Lake City still mostly Mormon?
No, not in the county-level sense cited in the reporting: Salt Lake County fell to 49% LDS in 2018, so it was no longer a majority-Mormon county. Utah as a whole remained majority-LDS, but Salt Lake County became the clearest sign of local diversification.
Why does this matter nationally?
Salt Lake City is the headquarters of the LDS Church, so shifts there are watched as a bellwether for broader cultural and institutional changes. The county's changing demographics help explain why Utah is often discussed less as a monolithic religious state and more as a fast-growing, increasingly mixed metro region.