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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 % Change
Southern Baptist Convention Evangelical Protestant Baptist +31 +3,144 +23.6%
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist +10 -1,483 -23.1%
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist +10 +6,858 +52.4%
Muslim Estimate Other Other Groups +9 +1,811 +38.4%
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints +7 +9,378 +61.6%
Vineyard USA Evangelical Protestant Pentecostal +7 +4,026 +193.1%
Calvary Chapel Fellowship Churches Evangelical Protestant Pentecostal +5 --- ---
Church of the Nazarene Evangelical Protestant Holiness +5 -838 -7.6%
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed +4 +960 +106.8%
United Reformed Churches in North America Evangelical Protestant Presbyterian-Reformed +4 --- ---
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed +3 +276 +24.1%
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed +2 -1,268 -5.8%
Conservative Baptist Association of America Evangelical Protestant Baptist +2 --- ---
Reformed Church in America Mainline Protestant Presbyterian-Reformed +2 +4,005 +10.9%
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox Eastern Liturgical (Orthodox) +1 -292 -29.4%
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal +1 +146 +12.0%
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church +1 +229 +112.8%
Churches of God, General Conference Evangelical Protestant Presbyterian-Reformed +1 -96 -21.3%
International Pentecostal Holiness Church Evangelical Protestant Pentecostal +1 +129 +117.3%
Missionary Church, The Evangelical Protestant Holiness +1 -50 -12.8%
North American Baptist Conference Evangelical Protestant Baptist +1 -191 -8.3%
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed +1 +7 +4.8%
Unitarian Universalist Association of Congregations Other Liberal +1 +533 +29.4%
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church +0 -127 -6.0%
Association of Free Lutheran Congregations Evangelical Protestant Lutheran +0 --- ---
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church +0 +162 +77.9%
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church +0 -2 -2.0%
Brethren In Christ Church Evangelical Protestant European Free-Church +0 --- ---
Churches of Christ Evangelical Protestant Baptist +0 +31 +0.7%
Conservative Mennonite Conference Evangelical Protestant European Free-Church +0 -129 -18.9%
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed +0 -107 -79.9%
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist +0 -751 -28.6%
Evangelical Presbyterian Church Evangelical Protestant Presbyterian-Reformed +0 -248 -58.2%
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) +0 -578 -32.9%
International Churches of Christ Evangelical Protestant Baptist +0 -104 -73.2%
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran +0 -14,927 -12.4%
Mennonite Church USA Evangelical Protestant European Free-Church +0 -75 -1.9%
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups +0 +38 +26.8%
National Association of Free Will Baptists Evangelical Protestant Baptist +0 +94 +100.0%
Old Order River Brethren Evangelical Protestant European Free-Church +0 +13 +20.6%
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed +0 +50 +6.3%
Reformed Baptist Churches Evangelical Protestant Baptist +0 --- ---
Reformed Church in the United States Evangelical Protestant Presbyterian-Reformed +0 -30 -19.1%
Sikh Other Other Groups +0 --- ---
Bahá'í Other Other Groups -1 +7 +0.7%
Christian Union Evangelical Protestant Other Groups -1 --- ---
Church of God (Anderson, Indiana) Evangelical Protestant Holiness -1 -46 -13.8%
Church of God General Conference Evangelical Protestant Adventist -1 -42 -34.7%
Church of God of Prophecy Evangelical Protestant Pentecostal -1 +21 +5.0%
Free Methodist Church of North America Evangelical Protestant Holiness -1 -78 -10.8%
Salvation Army Evangelical Protestant Holiness -1 -3,694 -40.0%
Seventh-day Adventist Church Evangelical Protestant Adventist -1 +122 +2.7%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran -1 -418 -23.8%
Church of the Brethren Evangelical Protestant European Free-Church -2 -887 -25.9%
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed -2 -282 -50.1%
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal -2 -1,549 -33.3%
General Association of Regular Baptist Churches Evangelical Protestant Baptist -2 --- ---
International Council of Community Churches Mainline Protestant Presbyterian-Reformed -2 --- ---
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed -2 -541 -24.9%
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism -3 -3,670 -28.8%
Pentecostal Church of God Evangelical Protestant Pentecostal -3 -387 -54.2%
Christian and Missionary Alliance, The Evangelical Protestant Holiness -4 +505 +10.8%
Christian Churches and Churches of Christ Evangelical Protestant Baptist -6 -1,800 -7.1%
Wesleyan Church, The Evangelical Protestant Holiness -7 -3,163 -53.1%
Assemblies of God Evangelical Protestant Pentecostal -8 -271 -1.0%
Christian Church (Disciples of Christ) Mainline Protestant Baptist -10 -16,503 -29.9%
American Baptist Churches in the USA Mainline Protestant Baptist -11 -8,481 -33.1%
Community of Christ Other Latter-day Saints -12 +1,532 +25.0%
United Church of Christ Mainline Protestant Presbyterian-Reformed -17 -10,207 -20.7%
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed -23 -18,592 -26.6%
United Methodist Church, The Mainline Protestant Methodist/Pietist -52 -13,021 -5.2%
Catholic Church Catholic Catholicism -54 -55,012 -9.9%
Evangelical Lutheran Church in America Mainline Protestant Lutheran -71 -38,986 -14.5%
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 --- --- ---
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 --- --- ---
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 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 --- --- ---
Reform Judaism Other Judaism --- --- ---
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) --- --- ---
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: -192 -164,849 -10%

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.

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.