State Membership Report
 Maps and Reports > Select State >
Search Maps & Reports:


Religious Traditions, 2010

201,546 822 57,056 123,400 818 418,013 765,927
Evangelical Protestant Black Protestant Mainline Protestant Catholic Orthodox Other Unclaimed

Congregational adherents include all full members, their children, and others who regularly attend services. The 2010 reports contain incomplete counts of congregations and adherents belonging to the eight largest historically African-American denominations. These denominations are not included in the 2000 reports and are largely missing from the 1990 and 1980 reports.
[More information on the data sources]


Religious Bodies Tradition Family Congregations Adherents % Change
Church of God (Seventh Day) Evangelical Protestant Adventist 0 --- ---
Seventh-day Adventist Church Evangelical Protestant Adventist +15 +3355 +50.1%
American Baptist Association, The Evangelical Protestant Baptist +1 +120 +53.3%
American Baptist Churches in the USA Mainline Protestant Baptist -4 -2830 -27.8%
Christian Church (Disciples of Christ) Mainline Protestant Baptist -4 -4081 -55.6%
Christian Churches and Churches of Christ Evangelical Protestant Baptist +4 +14010 +228.4%
Churches of Christ Evangelical Protestant Baptist +2 -192 -5.6%
Conservative Baptist Association of America Evangelical Protestant Baptist -1 --- ---
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist -4 -372 -80.5%
North American Baptist Conference Evangelical Protestant Baptist +1 +102 +66.2%
Southern Baptist Convention Evangelical Protestant Baptist +60 +3952 +43.5%
Catholic Church Catholic Catholicism +2 +52924 +75.1%
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism -1 -3363 -36.4%
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church +5 +828 +233.2%
Church of the Brethren Evangelical Protestant European Free-Church -2 -397 -34.4%
Christian and Missionary Alliance, The Evangelical Protestant Holiness +3 +1172 +292.3%
Church of God (Anderson, Indiana) Evangelical Protestant Holiness -2 -570 -30%
Church of the Nazarene Evangelical Protestant Holiness +1 +3572 +24.8%
Free Methodist Church of North America Evangelical Protestant Holiness +1 -273 -14.5%
Salvation Army Evangelical Protestant Holiness 0 +18053 +1484.6%
Christian Brethren Evangelical Protestant Ind. Fundamentalist -1 --- ---
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints +507 +168422 +69.9%
Unitarian Universalist Association of Congregations Other Liberal +4 +589 +354.8%
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran 0 +345 +383.3%
Church of the Lutheran Confession Evangelical Protestant Lutheran 0 --- ---
Evangelical Lutheran Church in America Mainline Protestant Lutheran -5 -4324 -34.2%
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran +5 -2890 -22.7%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran +1 +596 +322.2%
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 0 -33 -29.5%
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist +6 +972 +790.2%
United Methodist Church, The Mainline Protestant Methodist/Pietist -4 -988 -4.4%
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 0 -56 -70%
Assemblies of God Evangelical Protestant Pentecostal +11 +9081 +69.3%
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal -12 -88 -10.5%
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal +15 +317 +24.6%
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal -1 -122 -90.4%
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed -1 -156 -82.5%
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed +2 -63 -16.9%
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed -3 -4695 -38.5%
Reformed Church in America Mainline Protestant Presbyterian-Reformed +2 +1820 +730.9%
United Church of Christ Mainline Protestant Presbyterian-Reformed -6 -2025 -61.7%
Totals: +597 +252712 +54.3%

The population of Idaho was 943,935 in 1980. The adherent totals of the religious groups listed above (472,497) included 50.1% of the total population in 1980.

The population of Idaho was 1,567,582 in 2010; in 2000 it was 1,293,953. The total population changed 21.1%. The adherent totals of the religious groups listed above (801,655) included 51.1% of the total population in 2010.

* In an effort to better match the ASARB standards for adherents, a few religious bodies changed the way their adherents were reported in 2010, including the Catholic Church, Amish groups, Friends groups, Jewish groups, the Church of Jesus Christ of Latter-day Saints, Non-denominational Christian Churches, and the United Methodist Church. This change does not affect any of the data in the newly released 2010 U.S. Religion Census: Religious Congregations & Membership Study. In fact, the data for these groups are now more comparable to that of other bodies than it was in previous decadal reports.

However, the change in methodology can distort assessments on growth or decline between 2000 and 2010 for each of these groups. County-level 2000 data using the new methodology are not readily available. ASARB staff has adjusted some 2000 county-level adherent statistics to allow for a more accurate picture on growth or decline. The revised maps and charts are now available on-line at for those who are interested in these trends.


2010 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include statistics for 236 religious groups, providing information on the number of their congregations and adherents within each state and county in the United States. Clifford Grammich, Kirk Hadaway, Richard Houseal, Dale E. Jones, Alexei Krindatch, Richie Stanley and Richard H. Taylor supervised the collection. These data originally appeared in 2010 U.S. Religion Census: Religious Congregations & Membership Study, published by the Association of Statisticians of American Religious Bodies (ASARB). [More information on the data collection]

The adherence rate provides the number of adherents of a particular group per 1,000 population. For example, in 2010 the Episcopal Church had an adherence rate of 7.6 in Autauga County, Alabama. This means that about 8 out of every 1,000 people in Autauga County were Episcopalian.

Bookmark and Share