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Winnebago County (Illinois)

Religious Traditions, 2010

55,069 5,544 28,602 59,373 1,248 4,624 140,806
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
American Baptist Churches in the USA Mainline Protestant Baptist 3 1,274 5.08
American Carpatho-Russian Orthodox Diocese Orthodox Eastern Liturgical (Orthodox) 0 0 0.00
Assemblies of God Evangelical Protestant Pentecostal 4 3,943 15.72
Black Baptists Estimate Evangelical Protestant Baptist 0 0 0.00
Catholic Church Catholic Catholicism 16 40,725 162.33
Christian and Missionary Alliance, The Evangelical Protestant Holiness 1 38 0.15
Christian Brethren Evangelical Protestant Ind. Fundamentalist 1 50 0.20
Christian Church (Disciples of Christ) Mainline Protestant Baptist 2 199 0.79
Christian Churches and Churches of Christ Evangelical Protestant Baptist 4 1,710 6.82
Christian Methodist Episcopal Church Black Protestant Methodist/Pietist 1 432 1.72
Church of Christ, Scientist Other Christian Science 0 0 0.00
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 2 192 0.77
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 2 243 0.97
Church of God General Conference Evangelical Protestant Adventist 1 66 0.26
Church of God of Prophecy Evangelical Protestant Pentecostal 0 0 0.00
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 2 914 3.64
Church of the Brethren Evangelical Protestant European Free-Church 1 137 0.55
Church of the Nazarene Evangelical Protestant Holiness 5 747 2.98
Church of the United Brethren in Christ Evangelical Protestant Methodist/Pietist 0 0 0.00
Churches of Christ Evangelical Protestant Baptist 7 1,674 6.67
Conservative Baptist Association of America Evangelical Protestant Baptist 1 272 1.08
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 2 1,237 4.93
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed 1 185 0.74
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 3 1,523 6.07
Evangelical Congregational Church, The Evangelical Protestant Methodist/Pietist 1 20 0.08
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 9 2,942 11.73
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 6 2,422 9.65
Evangelical Lutheran Church in America Mainline Protestant Lutheran 22 22,292 88.85
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 1 67 0.27
Free Methodist Church of North America Evangelical Protestant Holiness 1 156 0.62
Friends (Quakers) Mainline Protestant European Free-Church 1 21 0.08
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 0 0 0.00
Independent, Charismatic Churches Evangelical Protestant Pentecostal 0 0 0.00
Independent, Non-Charismatic Churches Evangelical Protestant
0 0 0.00
International Pentecostal Holiness Church Evangelical Protestant Pentecostal 0 0 0.00
Jewish Other Judaism 2 485 1.93
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 9 5,528 22.03
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 1 31 0.12
National Association of Free Will Baptists Evangelical Protestant Baptist 0 0 0.00
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 1 563 2.24
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 8 5,441 21.69
Reformed Church in America Mainline Protestant Presbyterian-Reformed 1 196 0.78
Salvation Army Evangelical Protestant Holiness 2 942 3.75
Seventh-day Adventist Church Evangelical Protestant Adventist 1 384 1.53
Southern Baptist Convention Evangelical Protestant Baptist 10 2,595 10.34
Unitarian Universalist Association of Congregations Other Liberal 1 688 2.74
United Church of Christ Mainline Protestant Presbyterian-Reformed 8 4,402 17.55
United Methodist Church, The Mainline Protestant Methodist/Pietist 24 12,791 50.98
Wesleyan Church, The Evangelical Protestant Holiness 0 0 0.00
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 1 94 0.37
Totals: 169 117,621  

The population of Winnebago County, Illinois was 250,884 in 1980. The adherent totals of the religious groups listed above (117,621) included 46.9% of the total population in 1980.

* 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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