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Marion County (Iowa)

Religious Traditions, 2010

5,533 11,749 2,368 40 374 13,245
Evangelical 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]


Religious Bodies Tradition Family Congregations Adherents Adherence Rate
American Baptist Churches in the USA Mainline Protestant Baptist 2 832 24.98
Assemblies of God Evangelical Protestant Pentecostal 2 133 3.99
Bahá'í Other Other Groups 0 4 0.12
Catholic Church Catholic Catholicism 3 2,368 71.09
Christian Church (Disciples of Christ) Mainline Protestant Baptist 2 619 18.58
Christian Churches and Churches of Christ Evangelical Protestant Baptist 4 372 11.17
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 7 3,217 96.58
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 1 33 0.99
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 1 212 6.36
Church of the Nazarene Evangelical Protestant Holiness 2 252 7.57
Churches of Christ Evangelical Protestant Baptist 1 80 2.40
Communion of Reformed Evangelical Churches Evangelical Protestant Presbyterian-Reformed 1 --- ---
Community of Christ Other Latter-day Saints 1 158 4.74
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 1 90 2.70
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 1 350 10.51
Evangelical Lutheran Church in America Mainline Protestant Lutheran 2 820 24.62
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 1 40 1.20
Free Methodist Church of North America Evangelical Protestant Holiness 1 17 0.51
General Association of Regular Baptist Churches Evangelical Protestant Baptist 2 --- ---
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist 1 --- ---
Jehovah's Witnesses Other Adventist 1 --- ---
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 2 565 16.96
Non-denominational Evangelical Protestant
3 220 6.60
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 1 60 1.80
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) 1 40 1.20
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed 1 0 0.00
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 1 127 3.81
Reformed Church in America Mainline Protestant Presbyterian-Reformed 7 6,783 203.64
Seventh-day Adventist Church Evangelical Protestant Adventist 1 90 2.70
Southern Baptist Convention Evangelical Protestant Baptist 1 14 0.42
United Methodist Church, The Mainline Protestant Methodist/Pietist 13 2,568 77.10
United Pentecostal Church International Evangelical Protestant Pentecostal 2 --- ---
United Reformed Churches in North America Evangelical Protestant Presbyterian-Reformed 1 --- ---
Totals: 71 20,064  

The population of Marion County, Iowa was 33,309 in 2010; in 2000 it was 32,052. The total population changed 3.9%. The adherent totals of the religious groups listed above (20,064) included 60.2% 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 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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