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


Religious Traditions, 2010

201,546 822 57,056 818 123,400 418,013 765,927
Evangelical Protestant Black Protestant Mainline Protestant Orthodox Catholic 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 Adherence Rate
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 560 240,843 255.1
Catholic Church Catholic Catholicism 106 70,476 74.7
United Methodist Church, The Mainline Protestant Methodist/Pietist 65 22,303 23.6
Church of the Nazarene Evangelical Protestant Holiness 52 14,395 15.2
Assemblies of God Evangelical Protestant Pentecostal 78 13,102 13.9
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 38 12,753 13.5
Evangelical Lutheran Church in America Mainline Protestant Lutheran 40 12,661 13.4
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 53 12,205 12.9
American Baptist Churches in the USA Mainline Protestant Baptist 40 10,193 10.8
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 37 9,250 9.8
Southern Baptist Convention Evangelical Protestant Baptist 35 9,085 9.6
Christian Church (Disciples of Christ) Mainline Protestant Restoration Movement 20 7,342 7.8
Seventh-day Adventist Church Evangelical Protestant Adventist 45 6,692 7.1
Christian Churches and Churches of Christ Evangelical Protestant Restoration Movement 23 6,135 6.5
Churches of Christ Evangelical Protestant Restoration Movement 41 3,459 3.7
United Church of Christ Mainline Protestant Presbyterian-Reformed 17 3,280 3.5
Conservative Baptist Association of America Evangelical Protestant Baptist 11 3,074 3.3
Friends (Quakers) Mainline Protestant European Free-Church 13 2,142 2.3
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 10 1,899 2.0
Free Methodist Church of North America Evangelical Protestant Holiness 8 1,887 2.0
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 10 1,289 1.4
Salvation Army Evangelical Protestant Holiness 7 1,216 1.3
Church of the Brethren Evangelical Protestant European Free-Church 8 1,154 1.2
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 24 838 0.9
Mennonite Church, The General Conference Evangelical Protestant European Free-Church 1 520 0.6
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 5 462 0.5
Christian and Missionary Alliance, The Evangelical Protestant Holiness 5 401 0.4
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 1 372 0.4
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church 3 355 0.4
Mennonite Church Evangelical Protestant European Free-Church 5 331 0.4
Reformed Church in America Mainline Protestant Presbyterian-Reformed 1 249 0.3
American Baptist Association, The Evangelical Protestant Baptist 4 225 0.2
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 2 189 0.2
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 2 185 0.2
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 2 173 0.2
Unitarian Universalist Association of Congregations Other Liberal 2 166 0.2
North American Baptist Conference Evangelical Protestant Baptist 1 154 0.2
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 2 135 0.1
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 2 123 0.1
Christian Brethren Evangelical Protestant Ind. Fundamentalist 2 120 0.1
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 1 112 0.1
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran 1 90 0.1
Jewish Other Judaism 2 89 0.1
Baptist Missionary Association of America Evangelical Protestant Baptist 2 82 0.1
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 1 80 0.1
Church of God (Seventh Day) Evangelical Protestant Adventist 1 71 0.1
Advent Christian Church Evangelical Protestant Adventist 2 61 0.1
Missionary Church, The Evangelical Protestant Holiness 1 47 0.0
Church of the Lutheran Confession Evangelical Protestant Lutheran 1 32 0.0
Totals: 1,393 472,497  

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.

* 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