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Lake County (Illinois)

Religious Traditions, 2010

84,501 7,824 36,967 211,380 4,610 33,822 324,358
Evangelical Protestant Black 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
Southern Baptist Convention Evangelical Protestant Baptist +6 -3324 -53.5%
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist +3 +1097 +54.2%
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal +2 -52 -8%
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints +2 +1258 +51.8%
Churches of Christ Evangelical Protestant Baptist +2 +450 +96.4%
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist +2 -48 -1.5%
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran +2 -62 -1.2%
Seventh-day Adventist Church Evangelical Protestant Adventist +2 +550 +111.3%
American Baptist Churches in the USA Mainline Protestant Baptist +1 -429 -38.9%
Christian Churches and Churches of Christ Evangelical Protestant Baptist +1 +1077 +253.4%
Church of the Nazarene Evangelical Protestant Holiness +1 +27 +5.3%
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism +1 -1287 -18%
Evangelical Congregational Church, The Evangelical Protestant Methodist/Pietist +1 -50 -50.5%
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) +1 --- ---
Missionary Church, The Evangelical Protestant Holiness +1 +837 +109.7%
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed +1 +79 +94%
Armenian Apostolic Church of America (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) 0 -350 -77.8%
Catholic Church Catholic Catholicism 0 -31970 -13.1%
Church of God of Prophecy Evangelical Protestant Pentecostal 0 +70 +70.7%
Free Methodist Church of North America Evangelical Protestant Holiness 0 -175 -54.2%
Mennonite Church USA Evangelical Protestant European Free-Church 0 +42 +140%
North American Baptist Conference Evangelical Protestant Baptist 0 -29 -36.7%
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 0 -2862 -27.6%
Salvation Army Evangelical Protestant Holiness 0 +70 +79.5%
Unitarian Universalist Association of Congregations Other Liberal 0 +216 +41.9%
Wesleyan Church, The Evangelical Protestant Holiness 0 +85 +850%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 0 -591 -18.6%
Christian Church (Disciples of Christ) Mainline Protestant Baptist -1 -490 -48.3%
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal -1 +55 +157.1%
United Methodist Church, The Mainline Protestant Methodist/Pietist -1 -2576 -28.8%
Christian and Missionary Alliance, The Evangelical Protestant Holiness -2 +11 +5.3%
Church of Christ, Scientist Other Christian Science -2 --- ---
Evangelical Lutheran Church in America Mainline Protestant Lutheran -2 -1929 -13.2%
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist -2 --- ---
Assemblies of God Evangelical Protestant Pentecostal -3 -1290 -40.3%
United Church of Christ Mainline Protestant Presbyterian-Reformed -3 -3464 -58.4%
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed --- --- ---
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed --- --- ---
Totals: +12 -45054 -13.9%

The population of Lake County, Illinois was 516,418 in 1990; in 1980 it was 440,372. The total population changed 17.3%. The adherent totals of the religious groups listed above (335,886) included 65.0% of the total population in 1990.

The population of Lake County, Illinois was 703,462 in 2010; in 2000 it was 644,356. The total population changed 9.2%. The adherent totals of the religious groups listed above (379,104) included 53.9% 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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