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

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
United Methodist Church, The Mainline Protestant Methodist/Pietist 887 272,098 98.0
Catholic Church Catholic Catholicism 564 520,322 187.4
Evangelical Lutheran Church in America Mainline Protestant Lutheran 519 265,423 95.6
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 311 85,186 30.7
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 293 124,021 44.7
United Church of Christ Mainline Protestant Presbyterian-Reformed 209 59,450 21.4
Christian Church (Disciples of Christ) Mainline Protestant Baptist 167 50,771 18.3
Assemblies of God Evangelical Protestant Pentecostal 131 21,650 7.8
American Baptist Churches in the USA Mainline Protestant Baptist 124 32,175 11.6
Christian Churches and Churches of Christ Evangelical Protestant Baptist 123 24,137 8.7
Reformed Church in America Mainline Protestant Presbyterian-Reformed 74 33,337 12.0
Churches of Christ Evangelical Protestant Baptist 73 4,006 1.4
Church of the Nazarene Evangelical Protestant Holiness 72 12,934 4.7
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 67 14,198 5.1
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 62 21,129 7.6
Southern Baptist Convention Evangelical Protestant Baptist 60 13,960 5.0
Seventh-day Adventist Church Evangelical Protestant Adventist 55 5,426 2.0
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 51 8,056 2.9
Friends (Quakers) Mainline Protestant European Free-Church 51 6,235 2.2
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 47 --- ---
Christian Brethren Evangelical Protestant Ind. Fundamentalist 37 2,968 1.1
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 37 10,383 3.7
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 34 6,005 2.2
Mennonite Church USA Evangelical Protestant European Free-Church 33 5,304 1.9
Church of the Brethren Evangelical Protestant European Free-Church 31 3,599 1.3
Christian and Missionary Alliance, The Evangelical Protestant Holiness 28 3,871 1.4
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 28 3,262 1.2
Wesleyan Church, The Evangelical Protestant Holiness 25 5,615 2.0
Church of Christ, Scientist Other Christian Science 24 --- ---
Old Order Amish Evangelical Protestant European Free-Church 23 3,450 1.2
Free Methodist Church of North America Evangelical Protestant Holiness 21 1,073 0.4
Salvation Army Evangelical Protestant Holiness 21 2,794 1.0
Jewish Other Judaism 20 6,701 2.4
Evangelical Lutheran Synod Evangelical Protestant Lutheran 19 1,795 0.6
Conservative Baptist Association of America Evangelical Protestant Baptist 17 --- ---
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist 17 --- ---
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 16 1,335 0.5
Independent, Non-Charismatic Churches Evangelical Protestant
----
14 7,525 2.7
North American Baptist Conference Evangelical Protestant Baptist 14 2,782 1.0
Church of God of Prophecy Evangelical Protestant Pentecostal 12 328 0.1
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 12 2,473 0.9
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 11 670 0.2
Unitarian Universalist Association of Congregations Other Liberal 11 2,157 0.8
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 11 1,596 0.6
Churches of God, General Conference Evangelical Protestant Presbyterian-Reformed 10 658 0.2
American Association of Lutheran Churches Evangelical Protestant Lutheran 9 1,810 0.7
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church 8 1,443 0.5
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed 8 530 0.2
Missionary Church, The Evangelical Protestant Holiness 7 376 0.1
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran 6 483 0.2
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 6 --- ---
Pentecostal Church of God Evangelical Protestant Pentecostal 6 478 0.2
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed 6 768 0.3
Association of Free Lutheran Congregations Evangelical Protestant Lutheran 4 559 0.2
Church of God General Conference Evangelical Protestant Adventist 4 102 0.0
Church of the United Brethren in Christ Evangelical Protestant Methodist/Pietist 4 82 0.0
Independent, Charismatic Churches Evangelical Protestant Pentecostal 4 5,520 2.0
Advent Christian Church Evangelical Protestant Adventist 2 113 0.0
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church 2 243 0.1
Brethren In Christ Church Evangelical Protestant European Free-Church 2 68 0.0
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 2 547 0.2
Netherlands Reformed Congregations Evangelical Protestant Presbyterian-Reformed 2 1,525 0.5
Primitive Methodist Church in the USA Evangelical Protestant Methodist/Pietist 2 24 0.0
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist 1 269 0.1
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church 1 223 0.1
Church of God (Seventh Day) Evangelical Protestant Adventist 1 73 0.0
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 124 0.0
Evangelical Methodist Church Evangelical Protestant Methodist/Pietist 1 10 0.0
Evangelical Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 209 0.1
Latvian Evangelical Lutheran Church in America Mainline Protestant Lutheran 1 75 0.0
National Association of Free Will Baptists Evangelical Protestant Baptist 1 102 0.0
Old Order River Brethren Evangelical Protestant European Free-Church 1 64 0.0
Reformed Church in the United States Evangelical Protestant Presbyterian-Reformed 1 196 0.1
Armenian Apostolic Church of America (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) --- --- ---
Black Baptists Estimate Evangelical Protestant Baptist --- 14,188 5.1
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church --- --- ---
International Pentecostal Holiness Church Evangelical Protestant Pentecostal --- --- ---
Totals: 4,560 1,681,062  

The population of Iowa was 2,776,755 in 1990; in 1980 it was 2,904,733. The total population changed -4.4%. The adherent totals of the religious groups listed above (1,681,062) included 60.5% of the total population in 1990.

* 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.