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Washington 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
Catholic Church Catholic Catholic Liturgical Family 4 3,140 139.15
United Methodist Church Mainline Protestant Methodist Family 7 1,559 69.09
Mennonite Church, USA Evangelical Protestant Mennonite/Amish Family 5 973 43.12
Non-denominational Christian Churches Evangelical Protestant Other Groups Family 4 630 27.92
Amish Groups, undifferentiated Evangelical Protestant Mennonite/Amish Family 5 610 27.03
Church of Jesus Christ of Latter-day Saints Latter-day Saints Latter-day Saints (Mormonism) Family 1 501 22.20
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian/Reformed Family 3 492 21.80
Evangelical Lutheran Church in America Mainline Protestant Lutheran Family 1 326 14.45
American Baptist Churches in the U.S.A. Mainline Protestant Baptist Family 1 319 14.14
Jehovah's Witnesses Jehovah's Witnesses Adventist Family 1 168 7.45
Biblical Mennonite Alliance Evangelical Protestant Mennonite/Amish Family 1 134 5.94
Agape Christian Fellowship Evangelical Protestant Mennonite/Amish Family 1 100 4.43
Churches of God, General Conference Evangelical Protestant Presbyterian/Reformed Family 2 79 3.50
Assemblies of God, General Council of the Evangelical Protestant Pentecostal Family 1 70 3.10
Beachy Amish Mennonite Churches Evangelical Protestant Mennonite/Amish Family 1 61 2.70
Unaffiliated Amish-Mennonite (Conservative) Evangelical Protestant Mennonite/Amish Family 1 48 2.13
Reformed Presbyterian Church of North America (Covenanters) Evangelical Protestant Presbyterian/Reformed Family 1 47 2.08
Bethel Fellowship Mennonite Churches Evangelical Protestant Mennonite/Amish Family 1 45 1.99
Church of the Nazarene Evangelical Protestant Holiness Family 1 13 0.58
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal Family 1 10 0.44
Baha'i Faith Other Other Groups Family 0 9 0.40
Lutheran Church-Missouri Synod (LCMS) Evangelical Protestant Lutheran Family 1 8 0.35
Converge Worldwide Evangelical Protestant Baptist Family 3
Evangelical Free Church of America Evangelical Protestant Methodist Family 1
General Association of Regular Baptist Churches Evangelical Protestant Baptist Family 1

Religious Traditions (1980 - 2020), Percent of Population

The population of this county was 22,565 in 2020. The adherent totals of the religious groups listed above (9,342) included 41.4% 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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