State Membership Report
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Iowa

Denominational Groups, 2000

346,243 775,045 2,865 558,092 29,181 1,214,898
Evangelical Protestant Mainline Protestant Orthodox Catholic Other Unclaimed

Congregational "adherents" include all full members, their children, and others who regularly attend services. The historically African American denominations are not included in the 2000 congregation and membership totals. Many are also missing in 1990 and most historically African American denominations are missing in the 1980 reports.
[More information on the data sources]

Reports


Religious Bodies Theology Congregations Adherents Adherence Rate
Catholic Church Catholic 508 558,092 190.7
Evangelical Lutheran Church in America Mainline Protestant 510 268,543 91.8
United Methodist Church, The Mainline Protestant 862 248,211 84.8
Lutheran Church--Missouri Synod Evangelical Protestant 294 120,075 41.0
Presbyterian Church (U.S.A.) Mainline Protestant 306 69,974 23.9
Christian Church (Disciples of Christ) Mainline Protestant 146 55,157 18.9
United Church of Christ Mainline Protestant 195 49,205 16.8
Reformed Church in America Mainline Protestant 78 36,709 12.5
Assemblies of God Evangelical Protestant 137 28,026 9.6
American Baptist Churches in the USA Mainline Protestant 113 25,646 8.8
Christian Churches and Churches of Christ Evangelical Protestant 128 25,391 8.7
Christian Reformed Church in North America Evangelical Protestant 57 21,725 7.4
Church of Jesus Christ of Latter-day Saints, The Other Theology 62 15,236 5.2
General Association of Regular Baptist Churches Evangelical Protestant 101 14,390 4.9
Southern Baptist Convention Evangelical Protestant 75 13,322 4.6
Evangelical Free Church of America, The Evangelical Protestant 79 13,087 4.5
Episcopal Church Mainline Protestant 64 12,730 4.4
Independent, Non-Charismatic Churches Evangelical Protestant 13 11,110 3.8
Church of the Nazarene Evangelical Protestant 70 11,011 3.8
Salvation Army, The Evangelical Protestant 19 9,230 3.2
Baptist General Conference Evangelical Protestant 31 6,433 2.2
Jewish Estimate Other Theology 16 6,400 2.2
Community of Christ Evangelical Protestant 61 6,137 2.1
Wesleyan Church, The Evangelical Protestant 28 5,952 2.0
Independent, Charismatic Churches Evangelical Protestant 6 5,000 1.7
Muslim Estimate Other Theology 9 4,717 1.6
Christian and Missionary Alliance, The Evangelical Protestant 24 4,694 1.6
International Church of the Foursquare Gospel Evangelical Protestant 28 4,654 1.6
Friends (Quakers) Mainline Protestant 61 4,637 1.6
Seventh-day Adventist Church Evangelical Protestant 47 4,476 1.5
Churches of Christ Evangelical Protestant 71 4,229 1.5
Mennonite Church USA Evangelical Protestant 22 3,926 1.3
Church of the Brethren Evangelical Protestant 27 3,423 1.2
Evangelical Covenant Church, The Evangelical Protestant 18 2,622 0.9
Old Order Amish Church Evangelical Protestant 38 2,601 0.9
Conservative Baptist Association of America Evangelical Protestant 12 2,615 0.9
North American Baptist Conference Evangelical Protestant 14 2,304 0.8
National Association of Congregational Christian Churches Mainline Protestant 12 2,177 0.7
Apostolic Christian Church of America, Inc. Evangelical Protestant 8 2,116 0.7
Vineyard USA Evangelical Protestant 9 2,085 0.7
Unitarian Universalist Association of Congregations Other Theology 11 1,816 0.6
Greek Orthodox Archdiocese of America Orthodox 6 1,758 0.6
Wisconsin Evangelical Lutheran Synod Evangelical Protestant 12 1,756 0.6
Netherlands Reformed Congregations Evangelical Protestant 2 1,585 0.5
International Council of Community Churches Mainline Protestant 3 1,351 0.5
Church of God (Cleveland, Tennessee) Evangelical Protestant 18 1,217 0.4
Presbyterian Church in America Evangelical Protestant 8 1,143 0.4
Bahá'í Other Theology 9 1,012 0.4
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox 2 992 0.3
Conservative Congregational Christian Conference Evangelical Protestant 5 899 0.3
United Reformed Churches in North America Evangelical Protestant 4 874 0.3
Protestant Reformed Churches in America Evangelical Protestant 3 788 0.3
Free Methodist Church of North America Evangelical Protestant 18 719 0.3
Association of Free Lutheran Congregations, The Evangelical Protestant 7 721 0.3
Pentecostal Church of God Evangelical Protestant 6 714 0.2
Conservative Mennonite Conference Evangelical Protestant 5 684 0.2
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant 5 563 0.2
Churches of God, General Conference Evangelical Protestant 7 451 0.2
Christian Union Evangelical Protestant 8 453 0.2
Evangelical Presbyterian Church Evangelical Protestant 1 426 0.2
Church of God of Prophecy Evangelical Protestant 10 421 0.1
Missionary Church, The Evangelical Protestant 4 392 0.1
Church of God (Anderson, Indiana) Evangelical Protestant 10 333 0.1
Old Order Mennonite Evangelical Protestant 3 199 0.1
Beachy Amish Mennonite Churches Evangelical Protestant 2 208 0.1
Church of God in Christ, Mennonite Evangelical Protestant 3 203 0.1
Universal Fellowship of Metropolitan Community Churches Mainline Protestant 2 142 0.1
Reformed Church in the United States Evangelical Protestant 1 157 0.1
Orthodox Presbyterian Church, The Evangelical Protestant 3 146 0.1
New Testament Association of Independent Baptist Churches and other Fundamental Baptist Associations/Fellowships Evangelical Protestant 3 134 0.1
Cumberland Presbyterian Church Evangelical Protestant 1 134 0.1
International Churches of Christ Evangelical Protestant 1 142 0.1
International Pentecostal Holiness Church Evangelical Protestant 3 110 0.0
Church of God General Conference Evangelical Protestant 4 121 0.0
Mennonite; Other Groups Evangelical Protestant 4 131 0.0
Primitive Methodist Church in the USA Evangelical Protestant 2 121 0.0
Brethren Church, The (Ashland, Ohio) Evangelical Protestant 1 98 0.0
Armenian Apostolic Church / Catholicossate of Cilicia Orthodox 1 80 0.0
Old Order River Brethren Evangelical Protestant 1 63 0.0
American Baptist Association, The Evangelical Protestant 1 37 0.0
Greek Orthodox Archdiocese of Vasiloupulis Orthodox 1 35 0.0
Brethren In Christ Church Evangelical Protestant 1 29 0.0
National Association of Free Will Baptists Evangelical Protestant 2 0 0.0
Sikh Other Theology 2 n.a. n.a.
Reformed Baptist Churches Evangelical Protestant 1 n.a. n.a.
Buddhism Other Theology 7 n.a. n.a.
Primitive Baptist Churches--Old Line Evangelical Protestant 6 n.a. n.a.
Hindu Other Theology 3 n.a. n.a.
Calvary Chapel Fellowship Churches Evangelical Protestant 2 n.a. n.a.
Totals (Unadjusted)*: 4,584 1,711,426  
Total (Adjusted)**:   1,911,950  
The population of these 99 counties (or equivalents) in 1990 was 2,776,755; in 2000 it was 2,926,324. The total population changed 5.4%. The unadjusted adherent totals of the religious groups listed above (1,711,426) include 58.5% of the total population in 2000. The adjusted total adherents (1,911,950) include 65.3% of the population.

Source

*The “Unadjusted Totals” come from the 1990 and 2000 data collected by representatives of the Association of Statisticians of American Religious Bodies (ASARB). While quite comprehensive, this data excludes most of the historically African-American denominations and some other major groups. As a result, these numbers will be an underestimate of the total adherence rate, particularly in areas with a large African-American population. The 2000 data included 149 religious groups and the final results are published in Religious Congregations and Membership in the United States 2000. Copyright © 2002, All rights reserved. The 1990 data included 132 groups and the final results are published in Churches and Church Membership in the United States 1990 Copyright © 1990, All rights reserved. Published by Glenmary Research Center, 1312 Fifth Ave., North, Nashville, TN 37208. www.glenmary.org [More information on the data collection]

**The “Adjusted Totals” include all adherents in the denominations counted by the Association of Statisticians of American Religious Bodies (ASARB) and estimates adherent totals for the historically African-American denominations and other religious groups not listed in the ASARB totals. An article by Roger Finke and Christopher P. Scheitle (2005) reviews how these estimates were computed.

The adherence rate provides the number of adherents of a particular group per 1,000 population. For example, in 2000 the Episcopal Church had an adherence rate of approximately 8 (8.1) in Autauga County, Alabama. This means that 8 out of every 1,000 people in Autauga County are Episcopalian.

[More information on the data source]