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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 454 503,080 165.1
United Methodist Church, The Mainline Protestant Methodist/Pietist 810 235,190 77.2
Evangelical Lutheran Church in America Mainline Protestant Lutheran 439 229,557 75.4
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 294 105,148 34.5
Non-denominational Evangelical Protestant
----
339 74,985 24.6
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 283 51,382 16.9
Reformed Church in America Mainline Protestant Presbyterian-Reformed 80 40,714 13.4
United Church of Christ Mainline Protestant Presbyterian-Reformed 178 38,998 12.8
Christian Church (Disciples of Christ) Mainline Protestant Baptist 136 38,654 12.7
Lutheran Congregations in Mission for Christ Evangelical Protestant Lutheran 48 29,089 9.5
Assemblies of God Evangelical Protestant Pentecostal 129 27,755 9.1
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 69 24,614 8.1
Christian Churches and Churches of Christ Evangelical Protestant Baptist 122 23,591 7.7
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 59 20,457 6.7
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 89 19,945 6.5
American Baptist Churches in the USA Mainline Protestant Baptist 102 17,165 5.6
Southern Baptist Convention Evangelical Protestant Baptist 106 16,466 5.4
National Baptist Convention, USA, Inc. Black Protestant Baptist 19 13,265 4.4
Church of the Nazarene Evangelical Protestant Holiness 75 10,173 3.3
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 61 9,060 3.0
Community of Christ Other Latter-day Saints 49 7,669 2.5
Amish Groups, undifferentiated* Evangelical Protestant European Free-Church 52 7,179 2.4
Muslim Estimate Other Other Groups 18 6,528 2.1
Vineyard USA Evangelical Protestant Pentecostal 16 6,111 2.0
Salvation Army Evangelical Protestant Holiness 18 5,536 1.8
Christian and Missionary Alliance, The Evangelical Protestant Holiness 20 5,199 1.7
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 41 4,950 1.6
Seventh-day Adventist Church Evangelical Protestant Adventist 46 4,598 1.5
Churches of Christ Evangelical Protestant Baptist 71 4,260 1.4
Mennonite Church USA Evangelical Protestant European Free-Church 22 3,851 1.3
Friends United Meeting* Mainline Protestant European Free-Church 37 3,807 1.2
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 41 3,765 1.2
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 26 3,105 1.0
Wesleyan Church, The Evangelical Protestant Holiness 21 2,789 0.9
Church of the Brethren Evangelical Protestant European Free-Church 25 2,536 0.8
Reform Judaism Other Judaism 6 2,506 0.8
Unitarian Universalist Association of Congregations Other Liberal 12 2,349 0.8
African Methodist Episcopal Church Black Protestant Methodist/Pietist 12 2,198 0.7
North American Baptist Conference Evangelical Protestant Baptist 15 2,113 0.7
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church 8 1,989 0.7
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 18 1,871 0.6
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 9 1,859 0.6
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 10 1,636 0.5
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed 11 1,419 0.5
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 19 1,363 0.4
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 11 1,338 0.4
Evangelical Lutheran Synod Evangelical Protestant Lutheran 19 1,292 0.4
Hindu, Traditional Temples Other Other Groups 3 1,225 0.4
Church of God in Christ Black Protestant Pentecostal 9 1,183 0.4
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 6 1,180 0.4
Conservative Judaism Other Judaism 3 1,069 0.4
Bahá'í Other Other Groups 8 1,019 0.3
National Missionary Baptist Convention, Inc. Black Protestant Baptist 2 992 0.3
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed 3 838 0.3
Buddhism, Theravada Other Other Groups 5 739 0.2
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox Eastern Liturgical (Orthodox) 3 700 0.2
Free Methodist Church of North America Evangelical Protestant Holiness 17 641 0.2
Buddhism, Mahayana Other Other Groups 4 561 0.2
Conservative Mennonite Conference Evangelical Protestant European Free-Church 5 555 0.2
Conservative Yearly Meetings of Friends* Evangelical Protestant European Free-Church 9 545 0.2
Orthodox Judaism Other Judaism 4 510 0.2
Buddhism, Vajrayana Other Other Groups 2 493 0.2
Hindu, Indian-American Hindu Temple Assoc. Other Other Groups 2 488 0.2
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran 3 479 0.2
Church of God of Prophecy Evangelical Protestant Pentecostal 9 442 0.1
Amana Church Society Evangelical Protestant Communal 1 433 0.1
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church 4 432 0.1
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church 2 370 0.1
Churches of God, General Conference Evangelical Protestant Presbyterian-Reformed 8 355 0.1
Hindu, Post Renaissance Other Other Groups 8 346 0.1
Missionary Church, The Evangelical Protestant Holiness 5 342 0.1
Pentecostal Church of God Evangelical Protestant Pentecostal 3 327 0.1
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 9 287 0.1
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed 3 281 0.1
International Pentecostal Holiness Church Evangelical Protestant Pentecostal 4 239 0.1
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 2 180 0.1
Evangelical Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 178 0.1
Reformed Presbyterian Church of North America Evangelical Protestant Presbyterian-Reformed 3 166 0.1
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed 4 153 0.1
Serbian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) 1 140 0.0
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist 1 138 0.0
Coptic Orthodox Church Orthodox Eastern Liturgical (Orthodox) 2 130 0.0
Reformed Church in the United States Evangelical Protestant Presbyterian-Reformed 1 127 0.0
Christian Methodist Episcopal Church Black Protestant Methodist/Pietist 1 126 0.0
Berea Amish Mennonite* Evangelical Protestant European Free-Church 1 110 0.0
Tampico Amish Mennonite* Evangelical Protestant European Free-Church 1 103 0.0
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church 1 96 0.0
Heritage Reformed Churches Evangelical Protestant Presbyterian-Reformed 1 95 0.0
National Association of Free Will Baptists Evangelical Protestant Baptist 2 94 0.0
Church of God General Conference Evangelical Protestant Adventist 3 79 0.0
Old Order River Brethren Evangelical Protestant European Free-Church 1 76 0.0
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) 2 61 0.0
International Churches of Christ Evangelical Protestant Baptist 1 38 0.0
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 27 0.0
Malankara Orthodox Syrian Church Orthodox Eastern Liturgical (Orthodox) 1 21 0.0
Church of the United Brethren in Christ Evangelical Protestant Methodist/Pietist 2 17 0.0
Friends General Conference* Mainline Protestant European Free-Church 1 13 0.0
Zoroastrian Other Other Groups 0 1 0.0
American Association of Lutheran Churches Evangelical Protestant Lutheran 10 --- ---
Anglican Church in North America Evangelical Protestant Episcopalianism/Anglicanism 1 --- ---
Association of Free Lutheran Congregations Evangelical Protestant Lutheran 7 --- ---
Association of Reformed Baptist Churches of America Evangelical Protestant Baptist 1 --- ---
Brethren In Christ Church Evangelical Protestant European Free-Church 1 --- ---
Calvary Chapel Fellowship Churches Evangelical Protestant Pentecostal 7 --- ---
Christian Brethren Evangelical Protestant Ind. Fundamentalist 8 --- ---
Christian Union Evangelical Protestant Other Groups 7 --- ---
Church of Christ, Scientist Other Christian Science 13 --- ---
Church of God (Seventh Day) Evangelical Protestant Adventist 2 --- ---
Communion of Reformed Evangelical Churches Evangelical Protestant Presbyterian-Reformed 1 --- ---
Conservative Baptist Association of America Evangelical Protestant Baptist 14 --- ---
Covenant Reformed Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 --- ---
Evangelical Church, The Evangelical Protestant Holiness 6 --- ---
Evangelical Methodist Church Evangelical Protestant Methodist/Pietist 2 --- ---
Full Gospel Baptist Church Fellowship Black Protestant Baptist 2 --- ---
General Association of Regular Baptist Churches Evangelical Protestant Baptist 99 --- ---
Grace Brethren Churches, Fellowship of Mainline Protestant European Free-Church 6 --- ---
Grace Gospel Fellowship Evangelical Protestant Ind. Fundamentalist 1 --- ---
Independent Baptist Fellowship International Evangelical Protestant Baptist 7 --- ---
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist 14 --- ---
International Council of Community Churches Mainline Protestant Presbyterian-Reformed 1 --- ---
Jehovah's Witnesses Other Adventist 69 --- ---
National Spiritualist Association of Churches Other Spiritualist 4 --- ---
New Apostolic Church of North America, National Organization of the Other Other Groups 2 --- ---
New Testament Association of Independent Baptist Churches Evangelical Protestant Baptist 3 --- ---
North American Lutheran Church Evangelical Protestant Lutheran 28 --- ---
Presbyterian Reformed Church Evangelical Protestant Presbyterian-Reformed 1 --- ---
Reformed Baptist Churches Evangelical Protestant Baptist 1 --- ---
Reformed Presbyterian Church Hanover Presbytery Evangelical Protestant Presbyterian-Reformed 1 --- ---
Sikh Other Other Groups 2 --- ---
Swedenborgian Church Other Spiritualist 1 --- ---
Unaffiliated Friends Meetings* Mainline Protestant European Free-Church 1 --- ---
United Holy Church of America, Inc. Black Protestant Pentecostal 1 --- ---
United Pentecostal Church International Evangelical Protestant Pentecostal 46 --- ---
United Reformed Churches in North America Evangelical Protestant Presbyterian-Reformed 8 --- ---
Unity Churches, Association of Other Other Groups 5 --- ---
Totals: 5,107 1,642,344  

The population of Iowa was 3,046,355 in 2010; in 2000 it was 2,926,324. The total population changed 4.1%. The adherent totals of the religious groups listed above (1,642,344) included 53.9% 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 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.