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Iowa

Religious Traditions, 2010

402,376 17,902 666,637 503,080 2,232 50,117 1,404,011
Evangelical Protestant Black Protestant Mainline Protestant Catholic Orthodox 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 911 316,303 108.89
Catholic Church Catholic Catholicism 589 539,482 185.73
Evangelical Lutheran Church in America Mainline Protestant Lutheran 532 284,791 98.04
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 326 105,143 36.20
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 285 128,244 44.15
United Church of Christ Mainline Protestant Presbyterian-Reformed 217 61,585 21.20
Christian Church (Disciples of Christ) Mainline Protestant Baptist 173 54,611 18.80
Christian Churches and Churches of Christ Evangelical Protestant Baptist 136 23,432 8.07
American Baptist Churches in the USA Mainline Protestant Baptist 135 35,648 12.27
Assemblies of God Evangelical Protestant Pentecostal 121 24,743 8.52
Church of the Nazarene Evangelical Protestant Holiness 80 14,444 4.97
Churches of Christ Evangelical Protestant Baptist 75 4,996 1.72
Reformed Church in America Mainline Protestant Presbyterian-Reformed 73 32,899 11.33
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 70 17,905 6.16
Seventh-day Adventist Church Evangelical Protestant Adventist 65 5,679 1.96
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 60 21,360 7.35
Southern Baptist Convention Evangelical Protestant Baptist 55 10,564 3.64
Friends (Quakers) Mainline Protestant European Free-Church 50 6,566 2.26
Christian Brethren Evangelical Protestant Ind. Fundamentalist 43 2,645 0.91
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 40 7,336 2.53
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 38 3,965 1.37
Church of the Brethren Evangelical Protestant European Free-Church 32 4,435 1.53
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 31 5,665 1.95
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 30 8,088 2.78
Free Methodist Church of North America Evangelical Protestant Holiness 28 3,444 1.19
Mennonite Church Evangelical Protestant European Free-Church 25 3,991 1.37
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 21 2,518 0.87
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 20 892 0.31
Conservative Baptist Association of America Evangelical Protestant Baptist 19 2,635 0.91
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 19 3,193 1.10
Evangelical Lutheran Synod Evangelical Protestant Lutheran 19 2,236 0.77
Old Order Amish Evangelical Protestant European Free-Church 19 2,983 1.03
Salvation Army Evangelical Protestant Holiness 19 15,762 5.43
Christian and Missionary Alliance, The Evangelical Protestant Holiness 17 2,349 0.81
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 14 1,674 0.58
Jewish Other Judaism 14 2,540 0.87
North American Baptist Conference Evangelical Protestant Baptist 14 3,207 1.10
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 12 1,566 0.54
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 10 3,771 1.30
Unitarian Universalist Association of Congregations Other Liberal 10 1,660 0.57
Grace Brethren Churches, Fellowship of Mainline Protestant European Free-Church 9 1,300 0.45
Christian Union Evangelical Protestant Other Groups 8 682 0.23
Amana Church Society Evangelical Protestant Communal 7 789 0.27
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran 7 550 0.19
Missionary Church, The Evangelical Protestant Holiness 7 313 0.11
Church of God General Conference Evangelical Protestant Adventist 5 165 0.06
Evangelical Church, The Evangelical Protestant Holiness 5 254 0.09
Mennonite Church, The General Conference Evangelical Protestant European Free-Church 5 871 0.30
Reformed Presbyterian Church of North America Evangelical Protestant Presbyterian-Reformed 5 374 0.13
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 3 783 0.27
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 3 200 0.07
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed 3 543 0.19
Advent Christian Church Evangelical Protestant Adventist 2 116 0.04
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church 2 217 0.07
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church 2 280 0.10
Brethren In Christ Church Evangelical Protestant European Free-Church 2 172 0.06
Church of God (Seventh Day) Evangelical Protestant Adventist 2 50 0.02
Primitive Methodist Church in the USA Evangelical Protestant Methodist/Pietist 2 113 0.04
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist 1 269 0.09
American Baptist Association, The Evangelical Protestant Baptist 1 50 0.02
Association of Free Lutheran Congregations Evangelical Protestant Lutheran 1 203 0.07
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 189 0.07
Evangelical Methodist Church Evangelical Protestant Methodist/Pietist 1 20 0.01
Latvian Evangelical Lutheran Church in America Mainline Protestant Lutheran 1 114 0.04
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed 1 61 0.02
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed 1 76 0.03
American Association of Lutheran Churches Evangelical Protestant Lutheran 0 0 0.00
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church 0 0 0.00
Black Baptists Estimate Evangelical Protestant Baptist 0 0 0.00
Church of Christ, Scientist Other Christian Science 0 0 0.00
Church of God of Prophecy Evangelical Protestant Pentecostal 0 0 0.00
Church of the United Brethren in Christ Evangelical Protestant Methodist/Pietist 0 0 0.00
Churches of God, General Conference Evangelical Protestant Presbyterian-Reformed 0 0 0.00
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed 0 0 0.00
Evangelical Presbyterian Church Evangelical Protestant Presbyterian-Reformed 0 0 0.00
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 0 0 0.00
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist 0 0 0.00
Independent, Charismatic Churches Evangelical Protestant Pentecostal 0 0 0.00
Independent, Non-Charismatic Churches Evangelical Protestant
----
0 0 0.00
National Association of Free Will Baptists Evangelical Protestant Baptist 0 0 0.00
Netherlands Reformed Congregations Evangelical Protestant Presbyterian-Reformed 0 0 0.00
Old Order River Brethren Evangelical Protestant European Free-Church 0 0 0.00
Pentecostal Church of God Evangelical Protestant Pentecostal 0 0 0.00
Reformed Church in the United States Evangelical Protestant Presbyterian-Reformed 0 0 0.00
Wesleyan Church, The Evangelical Protestant Holiness 0 0 0.00
Totals: 4,534 1,783,704  

The population of Iowa was 2,904,733 in 1980. The adherent totals of the religious groups listed above (1,783,704) included 61.4% of the total population in 1980.

* 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.


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