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	810	235,190	77.2
Catholic Church	Catholic	Catholicism	454	503,080	165.1
Evangelical Lutheran Church in America	Mainline Protestant	Lutheran	439	229,557	75.4
Non-denominational	Evangelical Protestant	----	339	74,985	24.6
Lutheran Church--Missouri Synod	Evangelical Protestant	Lutheran	294	105,148	34.5
Presbyterian Church (U.S.A.)	Mainline Protestant	Presbyterian-Reformed	283	51,382	16.9
United Church of Christ	Mainline Protestant	Presbyterian-Reformed	178	38,998	12.8
Christian Church (Disciples of Christ)	Mainline Protestant	Baptist	136	38,654	12.7
Assemblies of God	Evangelical Protestant	Pentecostal	129	27,755	9.1
Christian Churches and Churches of Christ	Evangelical Protestant	Baptist	122	23,591	7.7
Southern Baptist Convention	Evangelical Protestant	Baptist	106	16,466	5.4
American Baptist Churches in the USA	Mainline Protestant	Baptist	102	17,165	5.6
General Association of Regular Baptist Churches	Evangelical Protestant	Baptist	99	---	---
Evangelical Free Church of America, The	Evangelical Protestant	Methodist/Pietist	89	19,945	6.5
Reformed Church in America	Mainline Protestant	Presbyterian-Reformed	80	40,714	13.4
Church of the Nazarene	Evangelical Protestant	Holiness	75	10,173	3.3
Churches of Christ	Evangelical Protestant	Baptist	71	4,260	1.4
Church of Jesus Christ of Latter-day Saints, The	Other	Latter-day Saints	69	24,614	8.1
Jehovah's Witnesses	Other	Adventist	69	---	---
Episcopal Church	Mainline Protestant	Episcopalianism/Anglicanism	61	9,060	3.0
Christian Reformed Church in North America	Evangelical Protestant	Presbyterian-Reformed	59	20,457	6.7
Amish Groups, undifferentiated*	Evangelical Protestant	European Free-Church	52	7,179	2.4
Community of Christ	Other	Latter-day Saints	49	7,669	2.5
Lutheran Congregations in Mission for Christ	Evangelical Protestant	Lutheran	48	29,089	9.5
Seventh-day Adventist Church	Evangelical Protestant	Adventist	46	4,598	1.5
United Pentecostal Church International	Evangelical Protestant	Pentecostal	46	---	---
Converge Worldwide/Baptist General Conference	Evangelical Protestant	Baptist	41	4,950	1.6
Open Bible Standard Churches, Inc.	Evangelical Protestant	Pentecostal	41	3,765	1.2
Friends United Meeting *	Mainline Protestant	European Free-Church	37	3,807	1.2
North American Lutheran Church	Evangelical Protestant	Lutheran	28	---	---
Foursquare Gospel, International Church of the	Evangelical Protestant	Pentecostal	26	3,105	1.0
Church of the Brethren	Evangelical Protestant	European Free-Church	25	2,536	0.8
Mennonite Church USA	Evangelical Protestant	European Free-Church	22	3,851	1.3
Wesleyan Church, The	Evangelical Protestant	Holiness	21	2,789	0.9
Christian and Missionary Alliance, The	Evangelical Protestant	Holiness	20	5,199	1.7
Church of God (Cleveland, Tennessee)	Evangelical Protestant	Pentecostal	19	1,363	0.4
Evangelical Lutheran Synod	Evangelical Protestant	Lutheran	19	1,292	0.4
National Baptist Convention, USA, Inc.	Black Protestant	Baptist	19	13,265	4.4
Evangelical Covenant Church, The	Evangelical Protestant	Methodist/Pietist	18	1,871	0.6
Muslim Estimate	Other	Other Groups	18	6,528	2.1
Salvation Army	Evangelical Protestant	Holiness	18	5,536	1.8
Free Methodist Church of North America	Evangelical Protestant	Holiness	17	641	0.2
Vineyard USA	Evangelical Protestant	Pentecostal	16	6,111	2.0
North American Baptist Conference	Evangelical Protestant	Baptist	15	2,113	0.7
Conservative Baptist Association of America	Evangelical Protestant	Baptist	14	---	---
Independent Fundamental Churches of America	Evangelical Protestant	Ind. Fundamentalist	14	---	---
Church of Christ, Scientist	Other	Christian Science	13	---	---
African Methodist Episcopal Church	Black Protestant	Methodist/Pietist	12	2,198	0.7
Unitarian Universalist Association of Congregations	Other	Liberal	12	2,349	0.8
Presbyterian Church in America	Evangelical Protestant	Presbyterian-Reformed	11	1,419	0.5
Wisconsin Evangelical Lutheran Synod	Evangelical Protestant	Lutheran	11	1,338	0.4
American Association of Lutheran Churches	Evangelical Protestant	Lutheran	10	---	---
National Association of Congregational Christian Churches	Mainline Protestant	Presbyterian-Reformed	10	1,636	0.5
Church of God (Anderson, Indiana)	Evangelical Protestant	Holiness	9	287	0.1
Church of God in Christ	Black Protestant	Pentecostal	9	1,183	0.4
Church of God of Prophecy	Evangelical Protestant	Pentecostal	9	442	0.1
Conservative Congregational Christian Conference	Evangelical Protestant	Presbyterian-Reformed	9	1,859	0.6
Conservative Yearly Meetings of Friends*	Evangelical Protestant	European Free-Church	9	545	0.2
Apostolic Christian Church of America, Inc.	Evangelical Protestant	European Free-Church	8	1,989	0.7
Bahá'í	Other	Other Groups	8	1,019	0.3
Christian Brethren	Evangelical Protestant	Ind. Fundamentalist	8	---	---
Churches of God, General Conference	Evangelical Protestant	Presbyterian-Reformed	8	355	0.1
Hindu, Post Renaissance	Other	Other Groups	8	346	0.1
United Reformed Churches in North America	Evangelical Protestant	Presbyterian-Reformed	8	---	---
Association of Free Lutheran Congregations	Evangelical Protestant	Lutheran	7	---	---
Calvary Chapel Fellowship Churches	Evangelical Protestant	Pentecostal	7	---	---
Christian Union	Evangelical Protestant	Other Groups	7	---	---
Independent Baptist Fellowship International	Evangelical Protestant	Baptist	7	---	---
Evangelical Church, The	Evangelical Protestant	Holiness	6	---	---
Grace Brethren Churches, Fellowship of	Mainline Protestant	European Free-Church	6	---	---
Greek Orthodox Archdiocese of America	Orthodox	Eastern Liturgical (Orthodox)	6	1,180	0.4
Reform Judaism	Other	Judaism	6	2,506	0.8
Buddhism, Theravada	Other	Other Groups	5	739	0.2
Conservative Mennonite Conference	Evangelical Protestant	European Free-Church	5	555	0.2
Missionary Church, The	Evangelical Protestant	Holiness	5	342	0.1
Unity Churches, Association of	Other	Other Groups	5	---	---
Buddhism, Mahayana	Other	Other Groups	4	561	0.2
Church of God in Christ, Mennonite	Evangelical Protestant	European Free-Church	4	432	0.1
International Pentecostal Holiness Church	Evangelical Protestant	Pentecostal	4	239	0.1
National Spiritualist Association of Churches	Other	Spiritualist	4	---	---
Orthodox Judaism	Other	Judaism	4	510	0.2
Orthodox Presbyterian Church, The	Evangelical Protestant	Presbyterian-Reformed	4	153	0.1
Antiochian Orthodox Christian Archdiocese of North America, The	Orthodox	Eastern Liturgical (Orthodox)	3	700	0.2
Church of God General Conference	Evangelical Protestant	Adventist	3	79	0.0
Church of the Lutheran Brethren of America	Evangelical Protestant	Lutheran	3	479	0.2
Congregational Christian Churches, Additional (not part of any national CCC body)	Mainline Protestant	Presbyterian-Reformed	3	281	0.1
Conservative Judaism	Other	Judaism	3	1,069	0.4
Hindu, Traditional Temples	Other	Other Groups	3	1,225	0.4
New Testament Association of Independent Baptist Churches	Evangelical Protestant	Baptist	3	---	---
Pentecostal Church of God	Evangelical Protestant	Pentecostal	3	327	0.1
Protestant Reformed Churches in America	Evangelical Protestant	Presbyterian-Reformed	3	838	0.3
Reformed Presbyterian Church of North America	Evangelical Protestant	Presbyterian-Reformed	3	166	0.1
Beachy Amish Mennonite Churches *	Evangelical Protestant	European Free-Church	2	370	0.1
Buddhism, Vajrayana	Other	Other Groups	2	493	0.2
Church of God (Seventh Day)	Evangelical Protestant	Adventist	2	---	---
Church of the United Brethren in Christ	Evangelical Protestant	Methodist/Pietist	2	17	0.0
Coptic Orthodox Church	Orthodox	Eastern Liturgical (Orthodox)	2	130	0.0
Evangelical Methodist Church	Evangelical Protestant	Methodist/Pietist	2	---	---
Full Gospel Baptist Church Fellowship	Black Protestant	Baptist	2	---	---
Hindu, Indian-American Hindu Temple Assoc.	Other	Other Groups	2	488	0.2
Metropolitan Community Churches, Universal Fellowship of	Mainline Protestant	Other Groups	2	180	0.1
National Association of Free Will Baptists	Evangelical Protestant	Baptist	2	94	0.0
National Missionary Baptist Convention, Inc.	Black Protestant	Baptist	2	992	0.3
New Apostolic Church of North America, National Organization of the	Other	Other Groups	2	---	---
Orthodox Church in America	Orthodox	Eastern Liturgical (Orthodox)	2	61	0.0
Sikh	Other	Other Groups	2	---	---
African Methodist Episcopal Zion Church	Black Protestant	Methodist/Pietist	1	138	0.0
Amana Church Society	Evangelical Protestant	Communal	1	433	0.1
Anglican Church in North America	Evangelical Protestant	Episcopalianism/Anglicanism	1	---	---
Association of Reformed Baptist Churches of America	Evangelical Protestant	Baptist	1	---	---
Berea Amish Mennonite*	Evangelical Protestant	European Free-Church	1	110	0.0
Brethren Church, The (Ashland, Ohio)	Evangelical Protestant	European Free-Church	1	96	0.0
Brethren In Christ Church	Evangelical Protestant	European Free-Church	1	---	---
Christian Methodist Episcopal Church	Black Protestant	Methodist/Pietist	1	126	0.0
Communion of Reformed Evangelical Churches	Evangelical Protestant	Presbyterian-Reformed	1	---	---
Covenant Reformed Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	1	---	---
Cumberland Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	1	27	0.0
Evangelical Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	1	178	0.1
Friends General Conference *	Mainline Protestant	European Free-Church	1	13	0.0
Grace Gospel Fellowship	Evangelical Protestant	Ind. Fundamentalist	1	---	---
Heritage Reformed Churches	Evangelical Protestant	Presbyterian-Reformed	1	95	0.0
International Churches of Christ	Evangelical Protestant	Baptist	1	38	0.0
International Council of Community Churches	Mainline Protestant	Presbyterian-Reformed	1	---	---
Malankara Orthodox Syrian Church	Orthodox	Eastern Liturgical (Orthodox)	1	21	0.0
Old Order River Brethren	Evangelical Protestant	European Free-Church	1	76	0.0
Presbyterian Reformed Church	Evangelical Protestant	Presbyterian-Reformed	1	---	---
Reformed Baptist Churches	Evangelical Protestant	Baptist	1	---	---
Reformed Church in the United States	Evangelical Protestant	Presbyterian-Reformed	1	127	0.0
Reformed Presbyterian Church Hanover Presbytery	Evangelical Protestant	Presbyterian-Reformed	1	---	---
Serbian Orthodox Church in North America	Orthodox	Eastern Liturgical (Orthodox)	1	140	0.0
Swedenborgian Church	Other	Spiritualist	1	---	---
Tampico Amish Mennonite*	Evangelical Protestant	European Free-Church	1	103	0.0
Unaffiliated Friends Meetings*	Mainline Protestant	European Free-Church	1	---	---
United Holy Church of America, Inc.	Black Protestant	Pentecostal	1	---	---
Zoroastrian	Other	Other Groups	0	1	0.0
		Totals:	5,107	1,642,344

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.

^* 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.