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Washington County (Idaho)

Religious Traditions, 2010

1,251 406 1,701 1,731 5,109
Evangelical Protestant Mainline Protestant 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
Advent Christian Church Evangelical Protestant Adventist 1 14 1.64
American Baptist Churches in the USA Mainline Protestant Baptist 3 488 57.08
Assemblies of God Evangelical Protestant Pentecostal 2 327 38.25
Catholic Church Catholic Catholicism 2 1,000 116.96
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 4 1,352 158.13
Church of the Nazarene Evangelical Protestant Holiness 1 160 18.71
Churches of Christ Evangelical Protestant Baptist 2 91 10.64
Conservative Baptist Association of America Evangelical Protestant Baptist 1 --- ---
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 1 73 8.54
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 1 23 2.69
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 1 40 4.68
Pentecostal Church of God Evangelical Protestant Pentecostal 1 6 0.70
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 1 175 20.47
Seventh-day Adventist Church Evangelical Protestant Adventist 3 326 38.13
Southern Baptist Convention Evangelical Protestant Baptist 1 55 6.43
United Baptists Evangelical Protestant Baptist 1 6 0.70
United Methodist Church, The Mainline Protestant Methodist/Pietist 1 486 56.84
Totals: 27 4,622  

The population of Washington County, Idaho was 8,550 in 1990; in 1980 it was 8,803. The total population changed -2.9%. The adherent totals of the religious groups listed above (4,622) included 54.1% of the total population in 1990.

* 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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