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^†
Catholic Church	Catholic	Catholicism	508	558,092	190.7
Evangelical Lutheran Church in America	Mainline Protestant	Lutheran	510	268,543	91.8
United Methodist Church, The	Mainline Protestant	Methodist/Pietist	862	248,211	84.8
Lutheran Church--Missouri Synod	Evangelical Protestant	Lutheran	294	120,075	41.0
Presbyterian Church (U.S.A.)	Mainline Protestant	Presbyterian-Reformed	306	69,974	23.9
Christian Church (Disciples of Christ)	Mainline Protestant	Baptist	146	55,157	18.8
United Church of Christ	Mainline Protestant	Presbyterian-Reformed	195	49,205	16.8
Reformed Church in America	Mainline Protestant	Presbyterian-Reformed	78	36,709	12.5
Assemblies of God	Evangelical Protestant	Pentecostal	137	28,026	9.6
American Baptist Churches in the USA	Mainline Protestant	Baptist	113	25,646	8.8
Christian Churches and Churches of Christ	Evangelical Protestant	Baptist	128	25,391	8.7
Christian Reformed Church in North America	Evangelical Protestant	Presbyterian-Reformed	57	21,725	7.4
Church of Jesus Christ of Latter-day Saints, The	Other	Latter-day Saints	62	15,236	5.2
General Association of Regular Baptist Churches	Evangelical Protestant	Baptist	101	14,390	4.9
Southern Baptist Convention	Evangelical Protestant	Baptist	75	13,322	4.6
Evangelical Free Church of America, The	Evangelical Protestant	Methodist/Pietist	79	13,087	4.5
Episcopal Church	Mainline Protestant	Episcopalianism/Anglicanism	64	12,730	4.4
Independent, Non-Charismatic Churches	Evangelical Protestant	----	13	11,110	3.8
Church of the Nazarene	Evangelical Protestant	Holiness	70	11,011	3.8
Salvation Army	Evangelical Protestant	Holiness	19	9,230	3.2
Converge Worldwide/Baptist General Conference	Evangelical Protestant	Baptist	31	6,433	2.2
Jewish	Other	Judaism	16	6,400	2.2
Community of Christ	Other	Latter-day Saints	61	6,137	2.1
Wesleyan Church, The	Evangelical Protestant	Holiness	28	5,952	2.0
Independent, Charismatic Churches	Evangelical Protestant	Pentecostal	6	5,000	1.7
Muslim Estimate	Other	Other Groups	9	4,717	1.6
Christian and Missionary Alliance, The	Evangelical Protestant	Holiness	24	4,694	1.6
Foursquare Gospel, International Church of the	Evangelical Protestant	Pentecostal	28	4,654	1.6
Friends (Quakers)	Mainline Protestant	European Free-Church	61	4,637	1.6
Seventh-day Adventist Church	Evangelical Protestant	Adventist	47	4,476	1.5
Churches of Christ	Evangelical Protestant	Baptist	71	4,229	1.4
Mennonite Church USA	Evangelical Protestant	European Free-Church	22	3,926	1.3
Church of the Brethren	Evangelical Protestant	European Free-Church	27	3,423	1.2
Evangelical Covenant Church, The	Evangelical Protestant	Methodist/Pietist	18	2,622	0.9
Conservative Baptist Association of America	Evangelical Protestant	Baptist	12	2,615	0.9
Old Order Amish	Evangelical Protestant	European Free-Church	38	2,601	0.9
North American Baptist Conference	Evangelical Protestant	Baptist	14	2,304	0.8
National Association of Congregational Christian Churches	Mainline Protestant	Presbyterian-Reformed	12	2,177	0.7
Apostolic Christian Church of America, Inc.	Evangelical Protestant	European Free-Church	8	2,116	0.7
Vineyard USA	Evangelical Protestant	Pentecostal	9	2,085	0.7
Unitarian Universalist Association of Congregations	Other	Liberal	11	1,816	0.6
Greek Orthodox Archdiocese of America	Orthodox	Eastern Liturgical (Orthodox)	6	1,758	0.6
Wisconsin Evangelical Lutheran Synod	Evangelical Protestant	Lutheran	12	1,756	0.6
Netherlands Reformed Congregations	Evangelical Protestant	Presbyterian-Reformed	2	1,585	0.5
International Council of Community Churches	Mainline Protestant	Presbyterian-Reformed	3	1,351	0.5
Church of God (Cleveland, Tennessee)	Evangelical Protestant	Pentecostal	18	1,217	0.4
Presbyterian Church in America	Evangelical Protestant	Presbyterian-Reformed	8	1,143	0.4
Bahá'í	Other	Other Groups	9	1,012	0.3
Antiochian Orthodox Christian Archdiocese of North America, The	Orthodox	Eastern Liturgical (Orthodox)	2	992	0.3
Conservative Congregational Christian Conference	Evangelical Protestant	Presbyterian-Reformed	5	899	0.3
United Reformed Churches in North America	Evangelical Protestant	Presbyterian-Reformed	4	874	0.3
Protestant Reformed Churches in America	Evangelical Protestant	Presbyterian-Reformed	3	788	0.3
Association of Free Lutheran Congregations	Evangelical Protestant	Lutheran	7	721	0.2
Free Methodist Church of North America	Evangelical Protestant	Holiness	18	719	0.2
Pentecostal Church of God	Evangelical Protestant	Pentecostal	6	714	0.2
Conservative Mennonite Conference	Evangelical Protestant	European Free-Church	5	684	0.2
Congregational Christian Churches, Additional (not part of any national CCC body)	Mainline Protestant	Presbyterian-Reformed	5	563	0.2
Christian Union	Evangelical Protestant	Other Groups	8	453	0.2
Churches of God, General Conference	Evangelical Protestant	Presbyterian-Reformed	7	451	0.2
Evangelical Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	1	426	0.1
Church of God of Prophecy	Evangelical Protestant	Pentecostal	10	421	0.1
Missionary Church, The	Evangelical Protestant	Holiness	4	392	0.1
Church of God (Anderson, Indiana)	Evangelical Protestant	Holiness	10	333	0.1
Beachy Amish Mennonite Churches *	Evangelical Protestant	European Free-Church	2	208	0.1
Church of God in Christ, Mennonite	Evangelical Protestant	European Free-Church	3	203	0.1
Old Order Mennonite	Evangelical Protestant	European Free-Church	3	199	0.1
Reformed Church in the United States	Evangelical Protestant	Presbyterian-Reformed	1	157	0.1
Orthodox Presbyterian Church, The	Evangelical Protestant	Presbyterian-Reformed	3	146	0.0
International Churches of Christ	Evangelical Protestant	Baptist	1	142	0.0
Metropolitan Community Churches, Universal Fellowship of	Mainline Protestant	Other Groups	2	142	0.0
Cumberland Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	1	134	0.0
New Testament Association of Independent Baptist Churches and other Fundamental Bapti	Evangelical Protestant	Baptist	3	134	0.0
Mennonite; Other Groups	Evangelical Protestant	European Free-Church	4	131	0.0
Church of God General Conference	Evangelical Protestant	Adventist	4	121	0.0
Primitive Methodist Church in the USA	Evangelical Protestant	Methodist/Pietist	2	121	0.0
International Pentecostal Holiness Church	Evangelical Protestant	Pentecostal	3	110	0.0
Brethren Church, The (Ashland, Ohio)	Evangelical Protestant	European Free-Church	1	98	0.0
Armenian Apostolic Church of America (Catholicosate of Cilicia)	Orthodox	Eastern Liturgical (Orthodox)	1	80	0.0
Old Order River Brethren	Evangelical Protestant	European Free-Church	1	63	0.0
American Baptist Association, The	Evangelical Protestant	Baptist	1	37	0.0
Greek Orthodox Archdiocese of Vasiloupulis	Orthodox	Eastern Liturgical (Orthodox)	1	35	0.0
Brethren In Christ Church	Evangelical Protestant	European Free-Church	1	29	0.0
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	---	---	---
Buddhists	Other	Other Groups	7	---	---
Calvary Chapel Fellowship Churches	Evangelical Protestant	Pentecostal	2	---	---
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	---	---	---
Hindus	Other	Other Groups	3	---	---
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 Association of Free Will Baptists	Evangelical Protestant	Baptist	2	0	---
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	---	---	---
Primitive Baptist Church, The	Evangelical Protestant	Baptist	6	---	---
Reform Judaism	Other	Judaism	---	---	---
Reformed Baptist Churches	Evangelical Protestant	Baptist	1	---	---
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)	---	---	---
Sikh	Other	Other Groups	2	---	---
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:	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.