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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 % Change
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist +51 +15980 +403%
Southern Baptist Convention Evangelical Protestant Baptist +51 +5902 +55.9%
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints +39 +16526 +204.3%
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist +10 -715 -12.6%
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed +10 +1343 +1767.1%
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran +9 -23096 -18%
Assemblies of God Evangelical Protestant Pentecostal +8 +3012 +12.2%
Reformed Church in America Mainline Protestant Presbyterian-Reformed +7 +7815 +23.8%
Association of Free Lutheran Congregations Evangelical Protestant Lutheran +6 --- ---
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed +6 +1076 +137.4%
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal +5 +587 +23.3%
Christian and Missionary Alliance, The Evangelical Protestant Holiness +3 +2850 +121.3%
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed +3 +92 +150.8%
Unitarian Universalist Association of Congregations Other Liberal +2 +689 +41.5%
Evangelical Church, The Evangelical Protestant Holiness +1 --- ---
Evangelical Methodist Church Evangelical Protestant Methodist/Pietist +1 --- ---
North American Baptist Conference Evangelical Protestant Baptist +1 -1094 -34.1%
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal +1 -3571 -48.7%
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist 0 -131 -48.7%
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church 0 +153 +70.5%
Church of God (Seventh Day) Evangelical Protestant Adventist 0 --- ---
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed 0 -162 -85.7%
Evangelical Lutheran Synod Evangelical Protestant Lutheran 0 -944 -42.2%
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 0 -2135 -56.6%
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed 0 +295 +54.3%
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church -1 -184 -65.7%
Brethren In Christ Church Evangelical Protestant European Free-Church -1 --- ---
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed -1 -903 -4.2%
Christian Union Evangelical Protestant Other Groups -1 --- ---
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal -1 +471 +52.8%
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist -1 -1322 -41.4%
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups -1 -20 -10%
Salvation Army Evangelical Protestant Holiness -1 -10226 -64.9%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran -1 -228 -14.6%
Church of God General Conference Evangelical Protestant Adventist -2 -86 -52.1%
Missionary Church, The Evangelical Protestant Holiness -2 +29 +9.3%
Reformed Presbyterian Church of North America Evangelical Protestant Presbyterian-Reformed -2 -208 -55.6%
Grace Brethren Churches, Fellowship of Mainline Protestant European Free-Church -3 --- ---
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran -4 -71 -12.9%
Churches of Christ Evangelical Protestant Baptist -4 -736 -14.7%
Church of God (Anderson, Indiana) Evangelical Protestant Holiness -5 -1387 -82.9%
Church of the Nazarene Evangelical Protestant Holiness -5 -4271 -29.6%
Conservative Baptist Association of America Evangelical Protestant Baptist -5 --- ---
Amana Church Society Evangelical Protestant Communal -6 -356 -45.1%
Church of the Brethren Evangelical Protestant European Free-Church -7 -1899 -42.8%
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism -9 -8845 -49.4%
Free Methodist Church of North America Evangelical Protestant Holiness -11 -2803 -81.4%
Christian Churches and Churches of Christ Evangelical Protestant Baptist -14 +159 +0.7%
Seventh-day Adventist Church Evangelical Protestant Adventist -19 -1081 -19%
American Baptist Churches in the USA Mainline Protestant Baptist -33 -18483 -51.8%
Christian Brethren Evangelical Protestant Ind. Fundamentalist -35 --- ---
Christian Church (Disciples of Christ) Mainline Protestant Baptist -37 -15957 -29.2%
United Church of Christ Mainline Protestant Presbyterian-Reformed -39 -22587 -36.7%
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed -43 -53761 -51.1%
Evangelical Lutheran Church in America Mainline Protestant Lutheran -93 -55234 -19.4%
United Methodist Church, The Mainline Protestant Methodist/Pietist -101 -81113 -25.6%
Catholic Church Catholic Catholicism -135 -36402 -6.7%
Totals: -409 -293032 -16.7%

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.

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.


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