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Iowa

Religious Traditions, 2010

402,376 17,902 666,637 2,232 503,080 50,117 1,404,011
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]

Reports


Religious Bodies Tradition Family Congregations Adherents Adherence Rate
Catholic Church Catholic Catholicism 508 558,092 190.7
Evangelical Lutheran Church in America Mainline Protestant Lutheran 510 268,543 91.8
United Methodist Church, The Mainline Protestant Methodist/Pietist 862 248,211 84.8
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 294 120,075 41.0
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 306 69,974 23.9
Christian Church (Disciples of Christ) Mainline Protestant Baptist 146 55,157 18.8
United Church of Christ Mainline Protestant Presbyterian-Reformed 195 49,205 16.8
Reformed Church in America Mainline Protestant Presbyterian-Reformed 78 36,709 12.5
Assemblies of God Evangelical Protestant Pentecostal 137 28,026 9.6
American Baptist Churches in the USA Mainline Protestant Baptist 113 25,646 8.8
Christian Churches and Churches of Christ Evangelical Protestant Baptist 128 25,391 8.7
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 57 21,725 7.4
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 62 15,236 5.2
General Association of Regular Baptist Churches Evangelical Protestant Baptist 101 14,390 4.9
Southern Baptist Convention Evangelical Protestant Baptist 75 13,322 4.6
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 79 13,087 4.5
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 64 12,730 4.4
Independent, Non-Charismatic Churches Evangelical Protestant
----
13 11,110 3.8
Church of the Nazarene Evangelical Protestant Holiness 70 11,011 3.8
Salvation Army Evangelical Protestant Holiness 19 9,230 3.2
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 31 6,433 2.2
Jewish Other Judaism 16 6,400 2.2
Community of Christ Other Latter-day Saints 61 6,137 2.1
Wesleyan Church, The Evangelical Protestant Holiness 28 5,952 2.0
Independent, Charismatic Churches Evangelical Protestant Pentecostal 6 5,000 1.7
Muslim Estimate Other Other Groups 9 4,717 1.6
Christian and Missionary Alliance, The Evangelical Protestant Holiness 24 4,694 1.6
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 28 4,654 1.6
Friends (Quakers) Mainline Protestant European Free-Church 61 4,637 1.6
Seventh-day Adventist Church Evangelical Protestant Adventist 47 4,476 1.5
Churches of Christ Evangelical Protestant Baptist 71 4,229 1.4
Mennonite Church USA Evangelical Protestant European Free-Church 22 3,926 1.3
Church of the Brethren Evangelical Protestant European Free-Church 27 3,423 1.2
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 18 2,622 0.9
Conservative Baptist Association of America Evangelical Protestant Baptist 12 2,615 0.9
Old Order Amish Evangelical Protestant European Free-Church 38 2,601 0.9
North American Baptist Conference Evangelical Protestant Baptist 14 2,304 0.8
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 12 2,177 0.7
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church 8 2,116 0.7
Vineyard USA Evangelical Protestant Pentecostal 9 2,085 0.7
Unitarian Universalist Association of Congregations Other Liberal 11 1,816 0.6
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 6 1,758 0.6
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 12 1,756 0.6
Netherlands Reformed Congregations Evangelical Protestant Presbyterian-Reformed 2 1,585 0.5
International Council of Community Churches Mainline Protestant Presbyterian-Reformed 3 1,351 0.5
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 18 1,217 0.4
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed 8 1,143 0.4
Bahá'í Other Other Groups 9 1,012 0.3
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox Eastern Liturgical (Orthodox) 2 992 0.3
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 5 899 0.3
United Reformed Churches in North America Evangelical Protestant Presbyterian-Reformed 4 874 0.3
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed 3 788 0.3
Association of Free Lutheran Congregations Evangelical Protestant Lutheran 7 721 0.2
Free Methodist Church of North America Evangelical Protestant Holiness 18 719 0.2
Pentecostal Church of God Evangelical Protestant Pentecostal 6 714 0.2
Conservative Mennonite Conference Evangelical Protestant European Free-Church 5 684 0.2
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed 5 563 0.2
Christian Union Evangelical Protestant Other Groups 8 453 0.2
Churches of God, General Conference Evangelical Protestant Presbyterian-Reformed 7 451 0.2
Evangelical Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 426 0.1
Church of God of Prophecy Evangelical Protestant Pentecostal 10 421 0.1
Missionary Church, The Evangelical Protestant Holiness 4 392 0.1
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 10 333 0.1
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church 2 208 0.1
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church 3 203 0.1
Old Order Mennonite Evangelical Protestant European Free-Church 3 199 0.1
Reformed Church in the United States Evangelical Protestant Presbyterian-Reformed 1 157 0.1
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed 3 146 0.0
International Churches of Christ Evangelical Protestant Baptist 1 142 0.0
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 2 142 0.0
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 134 0.0
New Testament Association of Independent Baptist Churches and other Fundamental Bapti Evangelical Protestant Baptist 3 134 0.0
Mennonite; Other Groups Evangelical Protestant European Free-Church 4 131 0.0
Church of God General Conference Evangelical Protestant Adventist 4 121 0.0
Primitive Methodist Church in the USA Evangelical Protestant Methodist/Pietist 2 121 0.0
International Pentecostal Holiness Church Evangelical Protestant Pentecostal 3 110 0.0
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church 1 98 0.0
Armenian Apostolic Church of America (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) 1 80 0.0
Old Order River Brethren Evangelical Protestant European Free-Church 1 63 0.0
American Baptist Association, The Evangelical Protestant Baptist 1 37 0.0
Greek Orthodox Archdiocese of Vasiloupulis Orthodox Eastern Liturgical (Orthodox) 1 35 0.0
Brethren In Christ Church Evangelical Protestant European Free-Church 1 29 0.0
African Methodist Episcopal Church Black Protestant Methodist/Pietist --- --- ---
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist --- --- ---
Amana Church Society Evangelical Protestant Communal --- --- ---
American Association of Lutheran Churches Evangelical Protestant Lutheran --- --- ---
Amish Groups, undifferentiated* Evangelical Protestant European Free-Church --- --- ---
Anglican Church in North America Evangelical Protestant Episcopalianism/Anglicanism --- --- ---
Association of Reformed Baptist Churches of America Evangelical Protestant Baptist --- --- ---
Berea Amish Mennonite* Evangelical Protestant European Free-Church --- --- ---
Buddhists Other Other Groups 7 --- ---
Calvary Chapel Fellowship Churches Evangelical Protestant Pentecostal 2 --- ---
Christian Brethren Evangelical Protestant Ind. Fundamentalist --- --- ---
Christian Methodist Episcopal Church Black Protestant Methodist/Pietist --- --- ---
Church of Christ, Scientist Other Christian Science --- --- ---
Church of God (Seventh Day) Evangelical Protestant Adventist --- --- ---
Church of God in Christ Black Protestant Pentecostal --- --- ---
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran --- --- ---
Church of the United Brethren in Christ Evangelical Protestant Methodist/Pietist --- --- ---
Communion of Reformed Evangelical Churches Evangelical Protestant Presbyterian-Reformed --- --- ---
Conservative Judaism Other Judaism --- --- ---
Conservative Yearly Meetings of Friends* Evangelical Protestant European Free-Church --- --- ---
Coptic Orthodox Church Orthodox Eastern Liturgical (Orthodox) --- --- ---
Covenant Reformed Presbyterian Church Evangelical Protestant Presbyterian-Reformed --- --- ---
Evangelical Church, The Evangelical Protestant Holiness --- --- ---
Evangelical Lutheran Synod Evangelical Protestant Lutheran --- --- ---
Evangelical Methodist Church Evangelical Protestant Methodist/Pietist --- --- ---
Friends General Conference* Mainline Protestant European Free-Church --- --- ---
Friends United Meeting* Mainline Protestant European Free-Church --- --- ---
Full Gospel Baptist Church Fellowship Black Protestant Baptist --- --- ---
Grace Brethren Churches, Fellowship of Mainline Protestant European Free-Church --- --- ---
Grace Gospel Fellowship Evangelical Protestant Ind. Fundamentalist --- --- ---
Heritage Reformed Churches Evangelical Protestant Presbyterian-Reformed --- --- ---
Hindus Other Other Groups 3 --- ---
Independent Baptist Fellowship International Evangelical Protestant Baptist --- --- ---
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist --- --- ---
Jehovah's Witnesses Other Adventist --- --- ---
Lutheran Congregations in Mission for Christ Evangelical Protestant Lutheran --- --- ---
Malankara Orthodox Syrian Church Orthodox Eastern Liturgical (Orthodox) --- --- ---
National Association of Free Will Baptists Evangelical Protestant Baptist 2 0 ---
National Baptist Convention, USA, Inc. Black Protestant Baptist --- --- ---
National Missionary Baptist Convention, Inc. Black Protestant Baptist --- --- ---
National Spiritualist Association of Churches Other Spiritualist --- --- ---
New Apostolic Church of North America, National Organization of the Other Other Groups --- --- ---
New Testament Association of Independent Baptist Churches Evangelical Protestant Baptist --- --- ---
Non-denominational Evangelical Protestant
----
--- --- ---
North American Lutheran Church Evangelical Protestant Lutheran --- --- ---
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal --- --- ---
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) --- --- ---
Orthodox Judaism Other Judaism --- --- ---
Presbyterian Reformed Church Evangelical Protestant Presbyterian-Reformed --- --- ---
Primitive Baptist Church, The Evangelical Protestant Baptist 6 --- ---
Reform Judaism Other Judaism --- --- ---
Reformed Baptist Churches Evangelical Protestant Baptist 1 --- ---
Reformed Presbyterian Church Hanover Presbytery Evangelical Protestant Presbyterian-Reformed --- --- ---
Reformed Presbyterian Church of North America Evangelical Protestant Presbyterian-Reformed --- --- ---
Serbian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) --- --- ---
Sikh Other Other Groups 2 --- ---
Swedenborgian Church Other Spiritualist --- --- ---
Tampico Amish Mennonite* Evangelical Protestant European Free-Church --- --- ---
Unaffiliated Friends Meetings* Mainline Protestant European Free-Church --- --- ---
United Holy Church of America, Inc. Black Protestant Pentecostal --- --- ---
United Pentecostal Church International Evangelical Protestant Pentecostal --- --- ---
Unity Churches, Association of Other Other Groups --- --- ---
Zoroastrian Other Other Groups --- --- ---
Totals: 4,584 1,711,426  

The population of Iowa was 2,926,324 in 2000; in 1990 it was 2,776,755. The total population changed 5.4%. The adherent totals of the religious groups listed above (1,711,426) included 58.5% of the total population in 2000.

* 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 www.usreligioncensus.org for those who are interested in these trends.

Source

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.