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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
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints +32 +14,231 +137.1%
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist +38 +11,889 +147.6%
Reformed Church in America Mainline Protestant Presbyterian-Reformed +6 +7,377 +22.1%
Assemblies of God Evangelical Protestant Pentecostal -2 +6,105 +28.2%
Salvation Army Evangelical Protestant Holiness -3 +2,742 +98.1%
Southern Baptist Convention Evangelical Protestant Baptist +46 +2,506 +18.0%
Christian and Missionary Alliance, The Evangelical Protestant Holiness -8 +1,328 +34.3%
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed +7 +1,312 +239.9%
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed +5 +651 +84.8%
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church +0 +546 +37.8%
Churches of Christ Evangelical Protestant Baptist -2 +254 +6.3%
Unitarian Universalist Association of Congregations Other Liberal +1 +192 +8.9%
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church +0 +127 +52.3%
Church of God of Prophecy Evangelical Protestant Pentecostal -3 +114 +34.8%
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal +3 +28 +2.1%
Old Order River Brethren Evangelical Protestant European Free-Church +0 +12 +18.8%
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran -3 -4 -0.8%
National Association of Free Will Baptists Evangelical Protestant Baptist +1 -8 -7.8%
Church of God General Conference Evangelical Protestant Adventist -1 -23 -22.5%
Evangelical Presbyterian Church Evangelical Protestant Presbyterian-Reformed +0 -31 -14.8%
Missionary Church, The Evangelical Protestant Holiness -2 -34 -9.0%
Church of the United Brethren in Christ Evangelical Protestant Methodist/Pietist -2 -65 -79.3%
Reformed Church in the United States Evangelical Protestant Presbyterian-Reformed +0 -69 -35.2%
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed +0 -97 -78.2%
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church +0 -127 -57.0%
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist +0 -131 -48.7%
Pentecostal Church of God Evangelical Protestant Pentecostal -3 -151 -31.6%
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal -2 -157 -4.8%
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed -5 -249 -47.0%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran +0 -258 -16.2%
Churches of God, General Conference Evangelical Protestant Presbyterian-Reformed -2 -303 -46.0%
Church of God (Anderson, Indiana) Evangelical Protestant Holiness -2 -383 -57.2%
Free Methodist Church of North America Evangelical Protestant Holiness -4 -432 -40.3%
Evangelical Lutheran Synod Evangelical Protestant Lutheran +0 -503 -28.0%
Christian Churches and Churches of Christ Evangelical Protestant Baptist -1 -546 -2.3%
North American Baptist Conference Evangelical Protestant Baptist +1 -669 -24.0%
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed -3 -672 -3.2%
Seventh-day Adventist Church Evangelical Protestant Adventist -9 -828 -15.3%
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed -2 -837 -33.8%
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist +7 -1,055 -17.6%
Church of the Brethren Evangelical Protestant European Free-Church -6 -1,063 -29.5%
Mennonite Church USA Evangelical Protestant European Free-Church -11 -1,453 -27.4%
Church of the Nazarene Evangelical Protestant Holiness +3 -2,761 -21.3%
Wesleyan Church, The Evangelical Protestant Holiness -4 -2,826 -50.3%
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism -6 -5,138 -36.2%
Christian Church (Disciples of Christ) Mainline Protestant Baptist -31 -12,117 -23.9%
American Baptist Churches in the USA Mainline Protestant Baptist -22 -15,010 -46.7%
Catholic Church Catholic Catholicism -110 -17,242 -3.3%
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran +1 -18,873 -15.2%
United Church of Christ Mainline Protestant Presbyterian-Reformed -31 -20,452 -34.4%
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed -28 -33,804 -39.7%
Evangelical Lutheran Church in America Mainline Protestant Lutheran -80 -35,866 -13.5%
United Methodist Church, The Mainline Protestant Methodist/Pietist -77 -36,908 -13.6%
American Association of Lutheran Churches Evangelical Protestant Lutheran +1 --- ---
Association of Free Lutheran Congregations Evangelical Protestant Lutheran +3 --- ---
Brethren In Christ Church Evangelical Protestant European Free-Church -1 --- ---
Christian Brethren Evangelical Protestant Ind. Fundamentalist -29 --- ---
Church of Christ, Scientist Other Christian Science -11 --- ---
Church of God (Seventh Day) Evangelical Protestant Adventist +1 --- ---
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church --- --- ---
Conservative Baptist Association of America Evangelical Protestant Baptist -3 --- ---
Evangelical Methodist Church Evangelical Protestant Methodist/Pietist +1 --- ---
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) +0 --- ---
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist -3 --- ---
International Pentecostal Holiness Church Evangelical Protestant Pentecostal --- --- ---
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal -6 --- ---
Totals: -361 -161,731 -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 2,776,755 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.