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Washington County (Oregon)

Religious Traditions, 2010

58,752 17,404 55,886 550 30,823 366,295
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 % Change
Catholic Church Catholic Catholicism +1 +16326 +41.3%
Assemblies of God Evangelical Protestant Pentecostal +3 +2766 +147.5%
Christian and Missionary Alliance, The Evangelical Protestant Holiness -1 -409 -83.3%
Christian Churches and Churches of Christ Evangelical Protestant Baptist +1 -34 -1.1%
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed +2 +328 +1640%
Church of God (Anderson, Indiana) Evangelical Protestant Holiness -1 -224 -39%
Church of the Nazarene Evangelical Protestant Holiness -2 +4 +0.4%
Churches of Christ Evangelical Protestant Baptist +1 +634 +48.5%
Conservative Baptist Association of America Evangelical Protestant Baptist -1 --- ---
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist +4 +282 +167.9%
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal +3 -2676 -36.6%
Free Methodist Church of North America Evangelical Protestant Holiness +1 +86 +51.8%
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist 0 --- ---
International Pentecostal Holiness Church Evangelical Protestant Pentecostal 0 -45 -73.8%
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 0 -613 -12.2%
North American Baptist Conference Evangelical Protestant Baptist +2 +585 +500%
Pentecostal Church of God Evangelical Protestant Pentecostal --- --- ---
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed --- --- ---
Salvation Army Evangelical Protestant Holiness +1 +217 +1808.3%
Seventh-day Adventist Church Evangelical Protestant Adventist +5 +1722 +68.4%
Southern Baptist Convention Evangelical Protestant Baptist +12 +2490 +117.1%
U.S. Mennonite Brethren Evangelical Protestant European Free-Church --- --- ---
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran +1 +20 +13.5%
American Baptist Churches in the USA Mainline Protestant Baptist -6 -787 -57.9%
Christian Church (Disciples of Christ) Mainline Protestant Baptist -1 +8 +0.6%
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism +2 +695 +34.7%
Evangelical Lutheran Church in America Mainline Protestant Lutheran +2 -565 -10.5%
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed +2 +352 +14.9%
United Church of Christ Mainline Protestant Presbyterian-Reformed -1 -594 -32.6%
United Methodist Church, The Mainline Protestant Methodist/Pietist +1 -769 -16.2%
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) --- --- ---
Church of Christ, Scientist Other Christian Science -2 --- ---
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints +15 +10451 +78.5%
Unitarian Universalist Association of Congregations Other Liberal +1 +287 +153.5%
Totals: +45 +30537 +31%

The population of Washington County, Oregon was 311,554 in 1990; in 1980 it was 245,808. The total population changed 26.7%. The adherent totals of the religious groups listed above (105,093) included 33.7% of the total population in 1990.

The population of Washington County, Oregon was 529,710 in 2010; in 2000 it was 445,342. The total population changed 18.9%. The adherent totals of the religious groups listed above (163,415) included 30.8% 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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