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O'Brien County, Iowa - County Membership Report (2020)

Exact definitions of "congregations" and "adherents" vary by religious body. Congregations may be parishes, churches, synagogues, mosques, temples, or another site where a religious body has regularly scheduled worship services. Adherents generally are members, children who are not members, and others who are not members but are considered participants in the congregation.

[More information on the data sources]

Religious Bodies Tradition Family Congregations Adherents Adherence Rate
Reformed Church in America Mainline Protestant Presbyterian/Reformed Family 5 1,992 140.46
Lutheran Church-Missouri Synod (LCMS) Evangelical Protestant Lutheran Family 6 1,726 121.70
Catholic Church Catholic Catholic Liturgical Family 3 1,664 117.33
United Methodist Church Mainline Protestant Methodist Family 6 977 68.89
Christian Reformed Church in North America Evangelical Protestant Presbyterian/Reformed Family 4 825 58.17
United Church of Christ Mainline Protestant Congregationalists (United Church of Christ) Family 3 597 42.10
United Reformed Churches in North America Evangelical Protestant Presbyterian/Reformed Family 1 383 27.01
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian/Reformed Family 2 357 25.17
Evangelical Lutheran Church in America Mainline Protestant Lutheran Family 2 249 17.56
Christian Churches and Churches of Christ Evangelical Protestant Restorationists Family 2 226 15.94
Non-denominational Christian Churches Evangelical Protestant Other Groups Family 1 90 6.35
Conservative Yearly Meetings of Friends Evangelical Protestant Friends/Brethren Family 1 71 5.01
Assemblies of God, General Council of the Evangelical Protestant Pentecostal Family 1 50 3.53
Churches of God, General Conference Evangelical Protestant Presbyterian/Reformed Family 1 28 1.97
New Testament Association of Independent Baptist Churches Evangelical Protestant Baptist Family 1
North American Lutheran Church Evangelical Protestant Lutheran Family 1

Religious Traditions (1980 - 2020), Percent of Population

The population of this county was 14,182 in 2020. The adherent totals of the religious groups listed above (9,235) included 65.1% of the total population in 2020. The adherence rate is the number of adherents of a given group per 1,000 people in the general population.

Note that data collection methods for religious bodies change over time, affecting the comparability of statistics. For further information, see the U.S. Religion Census website at

The 2020 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include data for 372 religious bodies or groups. Of these, the ASARB was able to gather data on congregations and adherents for 217 and on congregations only for 155.

[More information on the data sources]

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