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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
American Baptist Association, The Evangelical Protestant Baptist 1 37 0.01
American Baptist Churches in the USA Mainline Protestant Baptist 113 25,646 8.76
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox Eastern Liturgical (Orthodox) 2 992 0.34
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church 8 2,116 0.72
Armenian Apostolic Church of America (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) 1 80 0.03
Assemblies of God Evangelical Protestant Pentecostal 137 28,026 9.58
Association of Free Lutheran Congregations Evangelical Protestant Lutheran 7 721 0.25
Bahá'í Other Other Groups 9 1,012 0.35
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church 2 208 0.07
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church 1 98 0.03
Brethren In Christ Church Evangelical Protestant European Free-Church 1 29 0.01
Buddhists Other Other Groups 7 --- ---
Calvary Chapel Fellowship Churches Evangelical Protestant Pentecostal 2 --- ---
Catholic Church Catholic Catholicism 508 558,092 190.71
Christian and Missionary Alliance, The Evangelical Protestant Holiness 24 4,694 1.60
Christian Church (Disciples of Christ) Mainline Protestant Baptist 146 55,157 18.85
Christian Churches and Churches of Christ Evangelical Protestant Baptist 128 25,391 8.68
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 57 21,725 7.42
Christian Union Evangelical Protestant Other Groups 8 453 0.15
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 10 333 0.11
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 18 1,217 0.42
Church of God General Conference Evangelical Protestant Adventist 4 121 0.04
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church 3 203 0.07
Church of God of Prophecy Evangelical Protestant Pentecostal 10 421 0.14
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 62 15,236 5.21
Church of the Brethren Evangelical Protestant European Free-Church 27 3,423 1.17
Church of the Nazarene Evangelical Protestant Holiness 70 11,011 3.76
Churches of Christ Evangelical Protestant Baptist 71 4,229 1.45
Churches of God, General Conference Evangelical Protestant Presbyterian-Reformed 7 451 0.15
Community of Christ Other Latter-day Saints 61 6,137 2.10
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed 5 563 0.19
Conservative Baptist Association of America Evangelical Protestant Baptist 12 2,615 0.89
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 5 899 0.31
Conservative Mennonite Conference Evangelical Protestant European Free-Church 5 684 0.23
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 31 6,433 2.20
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 134 0.05
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 64 12,730 4.35
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 18 2,622 0.90
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 79 13,087 4.47
Evangelical Lutheran Church in America Mainline Protestant Lutheran 510 268,543 91.77
Evangelical Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 426 0.15
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 28 4,654 1.59
Free Methodist Church of North America Evangelical Protestant Holiness 18 719 0.25
Friends (Quakers) Mainline Protestant European Free-Church 61 4,637 1.58
General Association of Regular Baptist Churches Evangelical Protestant Baptist 101 14,390 4.92
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 6 1,758 0.60
Greek Orthodox Archdiocese of Vasiloupulis Orthodox Eastern Liturgical (Orthodox) 1 35 0.01
Hindus Other Other Groups 3 --- ---
Independent, Charismatic Churches Evangelical Protestant Pentecostal 6 5,000 1.71
Independent, Non-Charismatic Churches Evangelical Protestant
----
13 11,110 3.80
International Churches of Christ Evangelical Protestant Baptist 1 142 0.05
International Council of Community Churches Mainline Protestant Presbyterian-Reformed 3 1,351 0.46
International Pentecostal Holiness Church Evangelical Protestant Pentecostal 3 110 0.04
Jewish Other Judaism 16 6,400 2.19
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 294 120,075 41.03
Mennonite Church USA Evangelical Protestant European Free-Church 22 3,926 1.34
Mennonite; Other Groups Evangelical Protestant European Free-Church 4 131 0.04
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 2 142 0.05
Missionary Church, The Evangelical Protestant Holiness 4 392 0.13
Muslim Estimate Other Other Groups 9 4,717 1.61
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 12 2,177 0.74
National Association of Free Will Baptists Evangelical Protestant Baptist 2 0 0.00
Netherlands Reformed Congregations Evangelical Protestant Presbyterian-Reformed 2 1,585 0.54
New Testament Association of Independent Baptist Churches and other Fundamental Bapti Evangelical Protestant Baptist 3 134 0.05
North American Baptist Conference Evangelical Protestant Baptist 14 2,304 0.79
Old Order Amish Evangelical Protestant European Free-Church 38 2,601 0.89
Old Order Mennonite Evangelical Protestant European Free-Church 3 199 0.07
Old Order River Brethren Evangelical Protestant European Free-Church 1 63 0.02
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed 3 146 0.05
Pentecostal Church of God Evangelical Protestant Pentecostal 6 714 0.24
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 306 69,974 23.91
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed 8 1,143 0.39
Primitive Baptist Church, The Evangelical Protestant Baptist 6 --- ---
Primitive Methodist Church in the USA Evangelical Protestant Methodist/Pietist 2 121 0.04
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed 3 788 0.27
Reformed Baptist Churches Evangelical Protestant Baptist 1 --- ---
Reformed Church in America Mainline Protestant Presbyterian-Reformed 78 36,709 12.54
Reformed Church in the United States Evangelical Protestant Presbyterian-Reformed 1 157 0.05
Salvation Army Evangelical Protestant Holiness 19 9,230 3.15
Seventh-day Adventist Church Evangelical Protestant Adventist 47 4,476 1.53
Sikh Other Other Groups 2 --- ---
Southern Baptist Convention Evangelical Protestant Baptist 75 13,322 4.55
Unitarian Universalist Association of Congregations Other Liberal 11 1,816 0.62
United Church of Christ Mainline Protestant Presbyterian-Reformed 195 49,205 16.81
United Methodist Church, The Mainline Protestant Methodist/Pietist 862 248,211 84.82
United Reformed Churches in North America Evangelical Protestant Presbyterian-Reformed 4 874 0.30
Vineyard USA Evangelical Protestant Pentecostal 9 2,085 0.71
Wesleyan Church, The Evangelical Protestant Holiness 28 5,952 2.03
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 12 1,756 0.60
Totals: 4,584 1,711,426  

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.


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