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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 Adherence Rate
Catholic Church Catholic Catholicism 29 243,350 471.23
Evangelical Lutheran Church in America Mainline Protestant Lutheran 21 14,631 28.33
United Methodist Church, The Mainline Protestant Methodist/Pietist 19 8,951 17.33
Southern Baptist Convention Evangelical Protestant Baptist 16 6,210 12.03
United Church of Christ Mainline Protestant Presbyterian-Reformed 13 5,930 11.48
Assemblies of God Evangelical Protestant Pentecostal 12 3,202 6.20
Jewish Other Judaism 12 500 0.97
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 11 7,164 13.87
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 11 3,117 6.04
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 9 2,023 3.92
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 9 10,388 20.12
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 8 5,339 10.34
Church of Christ, Scientist Other Christian Science 7 --- ---
Churches of Christ Evangelical Protestant Baptist 7 467 0.90
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 7 3,171 6.14
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 6 2,428 4.70
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 5 654 1.27
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist 5 --- ---
Church of the Nazarene Evangelical Protestant Holiness 4 513 0.99
American Baptist Churches in the USA Mainline Protestant Baptist 3 1,103 2.14
Christian and Missionary Alliance, The Evangelical Protestant Holiness 3 209 0.40
Christian Brethren Evangelical Protestant Ind. Fundamentalist 3 255 0.49
Christian Church (Disciples of Christ) Mainline Protestant Baptist 3 1,015 1.97
Christian Churches and Churches of Christ Evangelical Protestant Baptist 3 425 0.82
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 3 35 0.07
Missionary Church, The Evangelical Protestant Holiness 3 763 1.48
Seventh-day Adventist Church Evangelical Protestant Adventist 3 494 0.96
Church of God of Prophecy Evangelical Protestant Pentecostal 2 99 0.19
Unitarian Universalist Association of Congregations Other Liberal 2 516 1.00
Armenian Apostolic Church of America (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) 1 450 0.87
Baptist Missionary Association of America Evangelical Protestant Baptist 1 53 0.10
Evangelical Congregational Church, The Evangelical Protestant Methodist/Pietist 1 99 0.19
Free Methodist Church of North America Evangelical Protestant Holiness 1 323 0.63
Friends (Quakers) Mainline Protestant European Free-Church 1 158 0.31
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 1 --- ---
Mennonite Church USA Evangelical Protestant European Free-Church 1 30 0.06
National Association of Free Will Baptists Evangelical Protestant Baptist 1 28 0.05
North American Baptist Conference Evangelical Protestant Baptist 1 79 0.15
Pentecostal Church of God Evangelical Protestant Pentecostal 1 77 0.15
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed 1 84 0.16
Reformed Church in America Mainline Protestant Presbyterian-Reformed 1 147 0.28
Salvation Army Evangelical Protestant Holiness 1 88 0.17
Wesleyan Church, The Evangelical Protestant Holiness 1 10 0.02
Apostolic Catholic Assyrian Church of the East, North American Dioceses Orthodox Eastern Liturgical (Orthodox) 0 333 0.64
Black Baptists Estimate Evangelical Protestant Baptist --- 10,975 21.25
Totals: 253 335,886  

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.

* 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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