The Church of Jesus Christ of Latter-day Saints · Compiled by this site from multiple public sources
Unlike the U.S.-only timeline above, this one has no gaps: worldwide membership is documented for every single year since the Church's 1830 founding in one coherent source lineage — the 2013 Church Almanac for 1830-2011, and the Church's own annual statistical reports for 2012-2025. 2025's figure (17,887,212) was independently cross-checked against the Church's current newsroom statistics page and matches exactly. See docs/datasets/worldwide-membership-history/README.md for the full source.