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Sioux 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 17 11,042 307.82
Christian Reformed Church in North America Evangelical Protestant Presbyterian/Reformed Family 19 7,408 206.51
Catholic Church Catholic Catholic Liturgical Family 6 3,318 92.50
Lutheran Church-Missouri Synod (LCMS) Evangelical Protestant Lutheran Family 4 1,370 38.19
Protestant Reformed Churches in America Evangelical Protestant Presbyterian/Reformed Family 2 756 21.07
Evangelical Lutheran Church in America Mainline Protestant Lutheran Family 3 623 17.37
United Reformed Churches in North America Evangelical Protestant Presbyterian/Reformed Family 3 536 14.94
United Methodist Church Mainline Protestant Methodist Family 3 439 12.24
Lutheran Congregations in Mission for Christ Evangelical Protestant Lutheran Family 2 280 7.81
American Baptist Churches in the U.S.A. Mainline Protestant Baptist Family 1 215 5.99
Christian and Missionary Alliance Evangelical Protestant Holiness Family 1 202 5.63
Presbyterian Church in America Evangelical Protestant Presbyterian/Reformed Family 2 124 3.46
United Church of Christ Mainline Protestant Congregationalists (United Church of Christ) Family 1 99 2.76
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian/Reformed Family 1 94 2.62
Heritage Reformed Churches Evangelical Protestant Presbyterian/Reformed Family 1 70 1.95
Assemblies of God, General Council of the Evangelical Protestant Pentecostal Family 1 55 1.53
Southern Baptist Convention Evangelical Protestant Baptist Family 1 43 1.20
Episcopal Church Mainline Protestant Anglican/Episcopal Family 1 38 1.06
Church of the Brethren Evangelical Protestant Friends/Brethren Family 1 30 0.84
Churches of Christ Evangelical Protestant Restorationists Family 1 30 0.84
Baha'i Faith Other Other Groups Family 0 4 0.11
ECO: A Covenant Order of Evangelical Presbyterians Evangelical Protestant Presbyterian/Reformed Family 2
Evangelical Free Church of America Evangelical Protestant Methodist Family 5
Netherlands Reformed Congregations Evangelical Protestant Presbyterian/Reformed Family 2
North American Lutheran Church Evangelical Protestant Lutheran Family 1

Religious Traditions (1980 - 2020), Percent of Population

The population of this county was 35,872 in 2020. The adherent totals of the religious groups listed above (26,776) included 74.6% 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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