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Not everyone who is included in the official Mormon membership number regularly attends LDS Church services. Attendance rates per country as calculated by Mormon researcher Matt Martinich were used for the chart below to distinguish "active" from "less active" members.
Moreover, LDS researchers estimate that "no fewer than 20% of LDS members worldwide are on the 'lost address file'. The true number may be as high as 25-28%" (source). An average of 24%, therefore, was applied to calculate the number of members whose address is unknown to the Mormon Church in the following chart:
Percentage church-attending members per region (orange area is global average):
Actual attendance per country (excl. USA):
Actual attendance per US state:
Congregation size per region:
Congregation size per country (actual attendance):