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Iowa - State Membership Report (2020)

Exact definitions of "congregations" and "adherents" vary by religious body. Congregations may be parishes, churches, synagogues, mosques, temples, or another site where a religious body has regularly scheduled worship services. Adherents generally are members, children who are not members, and others who are not members but are considered participants in the congregation.

[More information on the data sources]

Religious Bodies Tradition Family Congregations Adherents Adherence Rate
Catholic Church Catholic Catholic Liturgical Family 416 470,487 147.47
Evangelical Lutheran Church in America Mainline Protestant Lutheran Family 403 185,217 58.06
United Methodist Church Mainline Protestant Methodist Family 735 173,750 54.46
Lutheran Church-Missouri Synod (LCMS) Evangelical Protestant Lutheran Family 285 89,917 28.18
Non-denominational Christian Churches Evangelical Protestant Other Groups Family 289 85,426 26.78
Reformed Church in America Mainline Protestant Presbyterian/Reformed Family 79 41,570 13.03
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian/Reformed Family 242 32,550 10.20
Assemblies of God, General Council of the Evangelical Protestant Pentecostal Family 132 31,965 10.02
United Church of Christ Mainline Protestant Congregationalists (United Church of Christ) Family 162 29,595 9.28
Church of Jesus Christ of Latter-day Saints Latter-day Saints Latter-day Saints (Mormonism) Family 69 28,402 8.90
Muslim Estimate Islam Islam Family 23 23,211 7.28
Christian Churches and Churches of Christ Evangelical Protestant Restorationists Family 106 22,066 6.92
Lutheran Congregations in Mission for Christ Evangelical Protestant Lutheran Family 66 17,440 5.47
Southern Baptist Convention Evangelical Protestant Baptist Family 113 16,129 5.06
Christian Church (Disciples of Christ) Mainline Protestant Restorationists Family 111 15,618 4.90
Jehovah's Witnesses Jehovah's Witnesses Adventist Family 85 15,552 4.87
Christian Reformed Church in North America Evangelical Protestant Presbyterian/Reformed Family 61 14,914 4.67
American Baptist Churches in the U.S.A. Mainline Protestant Baptist Family 83 12,110 3.80
National Baptist Convention, USA, Inc. Black Protestant Baptist Family 14 10,619 3.33
Church of the Nazarene Evangelical Protestant Holiness Family 70 9,683 3.04
Amish Groups, undifferentiated Evangelical Protestant Mennonite/Amish Family 72 9,366 2.94
Episcopal Church Mainline Protestant Anglican/Episcopal Family 59 6,767 2.12
National Missionary Baptist Convention of America Black Protestant Baptist Family 21 6,454 2.02
Open Bible Churches Evangelical Protestant Pentecostal Family 45 5,438 1.70
Seventh-day Adventist Church Evangelical Protestant Adventist Family 47 4,953 1.55
Christian and Missionary Alliance Evangelical Protestant Holiness Family 23 4,905 1.54
Association of Vineyard Churches Evangelical Protestant Pentecostal Family 12 3,568 1.12
Churches of Christ Evangelical Protestant Restorationists Family 58 3,552 1.11
International Church of the Foursquare Gospel Evangelical Protestant Pentecostal Family 26 3,304 1.04
Hindu, Traditional Temples Hinduism Hinduism Family 4 2,950 0.92
Friends United Meeting Mainline Protestant Friends/Brethren Family 27 2,923 0.92
Wesleyan Church Evangelical Protestant Holiness Family 18 2,739 0.86
African Methodist Episcopal Church Black Protestant Methodist Family 10 2,664 0.84
Mennonite Church, USA Evangelical Protestant Mennonite/Amish Family 19 2,647 0.83
Church of God in Christ Black Protestant Pentecostal Family 14 2,304 0.72
Unitarian Universalist Association Other Christians Liberal Family 13 2,271 0.71
Reform Judaism Judaism Judaism Family 6 2,076 0.65
Church of the Brethren Evangelical Protestant Friends/Brethren Family 22 1,925 0.60
Apostolic Christian Church of America Evangelical Protestant Froehlich Churches Family 8 1,783 0.56
United Reformed Churches in North America Evangelical Protestant Presbyterian/Reformed Family 8 1,716 0.54
Evangelical Covenant Church Evangelical Protestant Methodist Family 16 1,604 0.50
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian/Reformed Family 8 1,571 0.49
National Association of Congregational Christian Churches Mainline Protestant Congregationalists (United Church of Christ) Family 13 1,441 0.45
Full Gospel Christian Assemblies International Evangelical Protestant Pentecostal Family 4 1,372 0.43
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran Family 9 1,360 0.43
Buddhism, Theravada Buddhism Buddhism Family 4 1,338 0.42
Salvation Army Evangelical Protestant Holiness Family 19 1,257 0.39
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal Family 17 1,237 0.39
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) Family 6 1,235 0.39
Hindu Yoga and Meditation Hinduism 6 1,081 0.34
Conservative Judaism Judaism Judaism Family 2 1,050 0.33
Baha'i Faith Other Other Groups Family 7 1,015 0.32
Evangelical Lutheran Synod Evangelical Protestant Lutheran Family 20 998 0.31
Protestant Reformed Churches in America Evangelical Protestant Presbyterian/Reformed Family 3 946 0.30
Presbyterian Church in America Evangelical Protestant Presbyterian/Reformed Family 10 921 0.29
Association of Free Lutheran Congregations Evangelical Protestant Lutheran Family 6 880 0.28
Progressive National Baptist Convention, Inc. Black Protestant Baptist Family 1 700 0.22
Church of God in Christ, Mennonite Evangelical Protestant Mennonite/Amish Family 5 660 0.21
Church of God (Anderson, Indiana) Evangelical Protestant Holiness Family 7 614 0.19
Full Gospel Baptist Church Fellowship International Black Protestant Baptist Family 4 612 0.19
Weaverland Mennonite Conference Evangelical Protestant Mennonite/Amish Family 1 580 0.18
Buddhism, Mahayana Buddhism Buddhism Family 3 550 0.17
Conservative Yearly Meetings of Friends Evangelical Protestant Friends/Brethren Family 8 493 0.15
Antiochian Orthodox Christian Archdiocese of North America Orthodox Eastern Liturgical (Orthodox) Family 4 477 0.15
Coptic Orthodox Church Orthodox Eastern Liturgical (Orthodox) Family 2 462 0.14
Conservative Mennonite Conference Evangelical Protestant Mennonite/Amish Family 3 447 0.14
Eritrean Orthodox Church Orthodox Eastern Liturgical (Orthodox) Family 1 420 0.13
Beachy Amish Mennonite Churches Evangelical Protestant Mennonite/Amish Family 3 335 0.11
Amana Church Society Evangelical Protestant Communal Family 1 321 0.10
Apostolic Christian Faith Evangelical Protestant Froehlich Churches Family 4 317 0.10
Missionary Church, The Evangelical Protestant Holiness Family 5 308 0.10
Free Methodist Church – USA Evangelical Protestant Holiness Family 9 292 0.09
Tampico Amish Mennonite Evangelical Protestant Mennonite/Amish Family 2 247 0.08
Evangelical Church of North America Evangelical Protestant Holiness Family 4 219 0.07
Ethiopian Orthodox Church Orthodox Eastern Liturgical (Orthodox) Family 2 200 0.06
Orthodox Judaism Judaism Judaism Family 1 200 0.06
Biblical Mennonite Alliance Evangelical Protestant Mennonite/Amish Family 2 196 0.06
Serbian Orthodox Church in North and South America Orthodox Eastern Liturgical (Orthodox) Family 1 190 0.06
African Methodist Episcopal Zion Church Black Protestant Methodist Family 1 180 0.06
Christian Methodist Episcopal Church Black Protestant Methodist Family 1 180 0.06
American Baptist Association Evangelical Protestant Baptist Family 1 178 0.06
Churches of God, General Conference Evangelical Protestant Presbyterian/Reformed Family 6 177 0.06
Berea Amish Mennonite Evangelical Protestant Mennonite/Amish Family 1 173 0.05
Dunkard Brethren Church Evangelical Protestant Friends/Brethren Family 1 160 0.05
Reformed Presbyterian Church of North America (Covenanters) Evangelical Protestant Presbyterian/Reformed Family 3 137 0.04
Agape Christian Fellowship Evangelical Protestant Mennonite/Amish Family 2 130 0.04
Advent Christian Church Evangelical Protestant Adventist Family 1 129 0.04
National Association of Free Will Baptists Evangelical Protestant Baptist Family 2 116 0.04
Church of God General Conference (Abrahamic Faith, McDonough, GA) Evangelical Protestant Adventist Family 3 113 0.04
Universal Fellowship of Metropolitan Community Churches Mainline Protestant Other Groups Family 1 89 0.03
Orthodox Church in America, The Orthodox Eastern Liturgical (Orthodox) Family 2 84 0.03
Russian Orthodox Church Outside of Russia, The Orthodox Eastern Liturgical (Orthodox) Family 3 82 0.03
International Churches of Christ Evangelical Protestant Baptist Family 1 79 0.02
Unaffiliated Conservative Mennonite Evangelical Protestant Mennonite/Amish Family 1 74 0.02
Mid-Atlantic Mennonite Fellowship Evangelical Protestant Mennonite/Amish Family 1 71 0.02
Heritage Reformed Churches Evangelical Protestant Presbyterian/Reformed Family 1 70 0.02
Nationwide Fellowship Mennonite Churches Evangelical Protestant Mennonite/Amish Family 2 65 0.02
Old Order Yorker River Brethren Evangelical Protestant Friends/Brethren Family 1 64 0.02
Unaffiliated Amish-Mennonite (Conservative) Evangelical Protestant Mennonite/Amish Family 1 48 0.02
Bethel Fellowship Mennonite Churches Evangelical Protestant Mennonite/Amish Family 1 45 0.01
Reformed Church in the United States Evangelical Protestant Presbyterian/Reformed Family 2 43 0.01
Primitive Baptists Associations Evangelical Protestant Baptist Family 1 42 0.01
Church of the Genuine Orthodox Christians of America Orthodox Eastern Liturgical (Orthodox) Family 1 40 0.01
Malankara (Indian) Orthodox Syrian Church Orthodox Eastern Liturgical (Orthodox) Family 1 26 0.01
Buddhism, Vajrayana Buddhism Buddhism Family 1 20 0.01
Cumberland Presbyterian Church Evangelical Protestant Presbyterian/Reformed Family 1 16 0.01
Church of the United Brethren in Christ, USA Evangelical Protestant Methodist Family 1 14 0.00
Mennonite Brethren Churches, U.S. Conference of Evangelical Protestant Mennonite/Amish Family 1 13 0.00
Friends General Conference Mainline Protestant Friends/Brethren Family 1 13 0.00
Swedenborgian Church Other Christians Spiritualist Family 1 6 0.00
Berean Fellowship of Churches Evangelical Protestant Independent Fundamentalist Family 2
ECO: A Covenant Order of Evangelical Presbyterians Evangelical Protestant Presbyterian/Reformed Family 4
Anglican Church in America Mainline Protestant Anglican/Episcopal Family 1
Fellowship of Christian Assemblies Evangelical Protestant Pentecostal Family 2
Grace Communion International Evangelical Protestant 1
United Church of God Other Christians Adventist Family 2
Vedanta Society Other Other Groups Family 1
Liberal Catholic Church, Province of the United States of America Other Christians Other Groups Family 1
The Church of God Evangelical Protestant 2
The Local Churches Evangelical Protestant 3
Chabad Judaism Judaism 4
Anglican Church in North America Evangelical Protestant Anglican/Episcopal Family 2
Converge Worldwide Evangelical Protestant Baptist Family 40
Brethren Church (Ashland, Ohio) Evangelical Protestant Friends/Brethren Family 1
Calvary Chapel Evangelical Protestant Pentecostal Family 1
Church of Christ, Scientist Other Christians Christian Science Family 2
Unity Churches, Association of Other Christians Other Groups Family 4
General Conference of the Church of God (Seventh Day) Evangelical Protestant Adventist Family 2
Church of God of Prophecy Evangelical Protestant Pentecostal Family 9
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran Family 3
Communion of Reformed Evangelical Churches Evangelical Protestant Presbyterian/Reformed Family 1
Community of Christ Evangelical Protestant Latter-day Saints (Mormonism) Family 44
Conservative Baptist Association of America (CBAmerica) Evangelical Protestant Baptist Family 11
Covenant Reformed Presbyterian Church Evangelical Protestant Presbyterian/Reformed Family 1
Evangelical Free Church of America Evangelical Protestant Methodist Family 100
Evangelical Presbyterian Church (1981) Evangelical Protestant Presbyterian/Reformed Family 4
Grace Gospel Fellowship Evangelical Protestant Independent Fundamentalist Family 1
Fellowship of Grace Brethren Churches Mainline Protestant Friends/Brethren Family 10
American Association of Lutheran Churches Evangelical Protestant Lutheran Family 9
Netherlands Reformed Congregations Evangelical Protestant Presbyterian/Reformed Family 2
New Testament Association of Independent Baptist Churches Evangelical Protestant Baptist Family 2
New Apostolic Church USA Other Christians Other Groups Family 1
North American Baptist Conference Evangelical Protestant Baptist Family 13
North American Lutheran Church Evangelical Protestant Lutheran Family 34
Orthodox Presbyterian Church Evangelical Protestant Presbyterian/Reformed Family 3
Pentecostal Church of God Evangelical Protestant Pentecostal Family 3
Christian Brethren (Plymouth Brethren) Evangelical Protestant Independent Fundamentalist Family 35
Presbyterian Reformed Church Evangelical Protestant Presbyterian/Reformed Family 1
Reformed Presbyterian Church Hanover Presbytery Evangelical Protestant Presbyterian/Reformed Family 1
General Association of Regular Baptist Churches Evangelical Protestant Baptist Family 89
American Sikh Council Other Other Groups Family 2
United Pentecostal Church International Evangelical Protestant Pentecostal Family 46
           

Religious Traditions (1980 - 2020), Percent of Population


The population of this state was 3,190,369 in 2020. The adherent totals of the religious groups listed above (1,431,349) included 44.9% of the total population in 2020. The adherence rate is the number of adherents of a given group per 1,000 people in the general population.

Note that data collection methods for religious bodies change over time, affecting the comparability of statistics. For further information, see the U.S. Religion Census website at https://www.usreligioncensus.org/.

The 2020 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include data for 372 religious bodies or groups. Of these, the ASARB was able to gather data on congregations and adherents for 217 and on congregations only for 155.

[More information on the data sources]

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