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	564	520,322	187.4
United Methodist Church, The	Mainline Protestant	Methodist/Pietist	887	272,098	98.0
Evangelical Lutheran Church in America	Mainline Protestant	Lutheran	519	265,423	95.6
Lutheran Church--Missouri Synod	Evangelical Protestant	Lutheran	293	124,021	44.7
Presbyterian Church (U.S.A.)	Mainline Protestant	Presbyterian-Reformed	311	85,186	30.7
United Church of Christ	Mainline Protestant	Presbyterian-Reformed	209	59,450	21.4
Christian Church (Disciples of Christ)	Mainline Protestant	Baptist	167	50,771	18.3
Reformed Church in America	Mainline Protestant	Presbyterian-Reformed	74	33,337	12.0
American Baptist Churches in the USA	Mainline Protestant	Baptist	124	32,175	11.6
Christian Churches and Churches of Christ	Evangelical Protestant	Baptist	123	24,137	8.7
Assemblies of God	Evangelical Protestant	Pentecostal	131	21,650	7.8
Christian Reformed Church in North America	Evangelical Protestant	Presbyterian-Reformed	62	21,129	7.6
Episcopal Church	Mainline Protestant	Episcopalianism/Anglicanism	67	14,198	5.1
Black Baptists Estimate	Evangelical Protestant	Baptist	---	14,188	5.1
Southern Baptist Convention	Evangelical Protestant	Baptist	60	13,960	5.0
Church of the Nazarene	Evangelical Protestant	Holiness	72	12,934	4.7
Church of Jesus Christ of Latter-day Saints, The	Other	Latter-day Saints	37	10,383	3.7
Evangelical Free Church of America, The	Evangelical Protestant	Methodist/Pietist	51	8,056	2.9
Independent, Non-Charismatic Churches	Evangelical Protestant	----	14	7,525	2.7
Jewish	Other	Judaism	20	6,701	2.4
Friends (Quakers)	Mainline Protestant	European Free-Church	51	6,235	2.2
Converge Worldwide/Baptist General Conference	Evangelical Protestant	Baptist	34	6,005	2.2
Wesleyan Church, The	Evangelical Protestant	Holiness	25	5,615	2.0
Independent, Charismatic Churches	Evangelical Protestant	Pentecostal	4	5,520	2.0
Seventh-day Adventist Church	Evangelical Protestant	Adventist	55	5,426	2.0
Mennonite Church USA	Evangelical Protestant	European Free-Church	33	5,304	1.9
Churches of Christ	Evangelical Protestant	Baptist	73	4,006	1.4
Christian and Missionary Alliance, The	Evangelical Protestant	Holiness	28	3,871	1.4
Church of the Brethren	Evangelical Protestant	European Free-Church	31	3,599	1.3
Old Order Amish	Evangelical Protestant	European Free-Church	23	3,450	1.2
Foursquare Gospel, International Church of the	Evangelical Protestant	Pentecostal	28	3,262	1.2
Christian Brethren	Evangelical Protestant	Ind. Fundamentalist	37	2,968	1.1
Salvation Army	Evangelical Protestant	Holiness	21	2,794	1.0
North American Baptist Conference	Evangelical Protestant	Baptist	14	2,782	1.0
National Association of Congregational Christian Churches	Mainline Protestant	Presbyterian-Reformed	12	2,473	0.9
Unitarian Universalist Association of Congregations	Other	Liberal	11	2,157	0.8
American Association of Lutheran Churches	Evangelical Protestant	Lutheran	9	1,810	0.7
Evangelical Lutheran Synod	Evangelical Protestant	Lutheran	19	1,795	0.6
Wisconsin Evangelical Lutheran Synod	Evangelical Protestant	Lutheran	11	1,596	0.6
Netherlands Reformed Congregations	Evangelical Protestant	Presbyterian-Reformed	2	1,525	0.5
Apostolic Christian Church of America, Inc.	Evangelical Protestant	European Free-Church	8	1,443	0.5
Church of God (Cleveland, Tennessee)	Evangelical Protestant	Pentecostal	16	1,335	0.5
Free Methodist Church of North America	Evangelical Protestant	Holiness	21	1,073	0.4
Presbyterian Church in America	Evangelical Protestant	Presbyterian-Reformed	6	768	0.3
Church of God (Anderson, Indiana)	Evangelical Protestant	Holiness	11	670	0.2
Churches of God, General Conference	Evangelical Protestant	Presbyterian-Reformed	10	658	0.2
Association of Free Lutheran Congregations	Evangelical Protestant	Lutheran	4	559	0.2
Conservative Congregational Christian Conference	Evangelical Protestant	Presbyterian-Reformed	2	547	0.2
Congregational Christian Churches, Additional (not part of any national CCC body)	Mainline Protestant	Presbyterian-Reformed	8	530	0.2
Church of the Lutheran Brethren of America	Evangelical Protestant	Lutheran	6	483	0.2
Pentecostal Church of God	Evangelical Protestant	Pentecostal	6	478	0.2
Missionary Church, The	Evangelical Protestant	Holiness	7	376	0.1
Church of God of Prophecy	Evangelical Protestant	Pentecostal	12	328	0.1
African Methodist Episcopal Zion Church	Black Protestant	Methodist/Pietist	1	269	0.1
Beachy Amish Mennonite Churches *	Evangelical Protestant	European Free-Church	2	243	0.1
Brethren Church, The (Ashland, Ohio)	Evangelical Protestant	European Free-Church	1	223	0.1
Evangelical Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	1	209	0.1
Reformed Church in the United States	Evangelical Protestant	Presbyterian-Reformed	1	196	0.1
Cumberland Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	1	124	0.0
Advent Christian Church	Evangelical Protestant	Adventist	2	113	0.0
Church of God General Conference	Evangelical Protestant	Adventist	4	102	0.0
National Association of Free Will Baptists	Evangelical Protestant	Baptist	1	102	0.0
Church of the United Brethren in Christ	Evangelical Protestant	Methodist/Pietist	4	82	0.0
Latvian Evangelical Lutheran Church in America	Mainline Protestant	Lutheran	1	75	0.0
Church of God (Seventh Day)	Evangelical Protestant	Adventist	1	73	0.0
Brethren In Christ Church	Evangelical Protestant	European Free-Church	2	68	0.0
Old Order River Brethren	Evangelical Protestant	European Free-Church	1	64	0.0
Primitive Methodist Church in the USA	Evangelical Protestant	Methodist/Pietist	2	24	0.0
Evangelical Methodist Church	Evangelical Protestant	Methodist/Pietist	1	10	0.0
Armenian Apostolic Church of America (Catholicosate of Cilicia)	Orthodox	Eastern Liturgical (Orthodox)	---	---	---
Church of Christ, Scientist	Other	Christian Science	24	---	---
Church of God in Christ, Mennonite	Evangelical Protestant	European Free-Church	---	---	---
Conservative Baptist Association of America	Evangelical Protestant	Baptist	17	---	---
Greek Orthodox Archdiocese of America	Orthodox	Eastern Liturgical (Orthodox)	6	---	---
Independent Fundamental Churches of America	Evangelical Protestant	Ind. Fundamentalist	17	---	---
International Pentecostal Holiness Church	Evangelical Protestant	Pentecostal	---	---	---
Open Bible Standard Churches, Inc.	Evangelical Protestant	Pentecostal	47	---	---
		Totals:	4,560	1,681,062

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.