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Polk County, Iowa

Religious Traditions, 2010

53,822 5,275 61,821 646 62,867 9,331 236,878
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]


Religious Bodies Tradition Family Congregations Adherents Adherence Rate
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist 1 269 0.9
American Baptist Churches in the USA Mainline Protestant Baptist 6 1,995 6.6
Assemblies of God Evangelical Protestant Pentecostal 10 2,963 9.8
Brethren In Christ Church Evangelical Protestant European Free-Church 1 86 0.3
Catholic Church Catholic Catholicism 22 43,395 143.1
Christian and Missionary Alliance, The Evangelical Protestant Holiness 1 88 0.3
Christian Brethren Evangelical Protestant Ind. Fundamentalist 3 320 1.1
Christian Church (Disciples of Christ) Mainline Protestant Baptist 19 10,365 34.2
Christian Churches and Churches of Christ Evangelical Protestant Baptist 8 2,021 6.7
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 1 208 0.7
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 1 228 0.8
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 3 151 0.5
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 2 981 3.2
Church of the Brethren Evangelical Protestant European Free-Church 2 432 1.4
Church of the Nazarene Evangelical Protestant Holiness 6 1,402 4.6
Churches of Christ Evangelical Protestant Baptist 10 844 2.8
Conservative Baptist Association of America Evangelical Protestant Baptist 1 121 0.4
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 2 581 1.9
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 6 2,906 9.6
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 2 560 1.8
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 7 1,083 3.6
Evangelical Lutheran Church in America Mainline Protestant Lutheran 24 17,958 59.2
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 1 263 0.9
Free Methodist Church of North America Evangelical Protestant Holiness 2 363 1.2
Friends (Quakers) Mainline Protestant European Free-Church 2 313 1.0
Grace Brethren Churches, Fellowship of Mainline Protestant European Free-Church 1 0 ---
Jewish Other Judaism 2 941 3.1
Latvian Evangelical Lutheran Church in America Mainline Protestant Lutheran 1 114 0.4
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 10 4,859 16.0
Mennonite Church Evangelical Protestant European Free-Church 1 39 0.1
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 1 80 0.3
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 13 3,305 10.9
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 16 10,031 33.1
Reformed Church in America Mainline Protestant Presbyterian-Reformed 3 1,266 4.2
Salvation Army Evangelical Protestant Holiness 2 1,647 5.4
Seventh-day Adventist Church Evangelical Protestant Adventist 2 866 2.9
Southern Baptist Convention Evangelical Protestant Baptist 5 1,466 4.8
Unitarian Universalist Association of Congregations Other Liberal 1 333 1.1
United Church of Christ Mainline Protestant Presbyterian-Reformed 6 4,301 14.2
United Methodist Church, The Mainline Protestant Methodist/Pietist 37 20,853 68.8
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 1 234 0.8
Totals: 245 140,231  

The population of Polk County, Iowa was 303,170 in 1980. The adherent totals of the religious groups listed above (140,231) included 46.3% of the total population in 1980.

* 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 for those who are interested in these trends.


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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