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Iroquois County (Illinois)

Religious Traditions, 2010

7,176 4,549 3,890 93 14,010
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
American Association of Lutheran Churches Evangelical Protestant Lutheran 1 --- ---
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church 1 310 10.43
Assemblies of God Evangelical Protestant Pentecostal 1 36 1.21
Association of Free Lutheran Congregations Evangelical Protestant Lutheran 2 --- ---
Bahá'í Other Other Groups 0 1 0.03
Catholic Church Catholic Catholicism 9 3,890 130.90
Christian Church (Disciples of Christ) Mainline Protestant Baptist 2 192 6.46
Christian Churches and Churches of Christ Evangelical Protestant Baptist 8 1,448 48.72
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 1 0 0.00
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 1 92 3.10
Church of the Nazarene Evangelical Protestant Holiness 3 258 8.68
Church of the United Brethren in Christ Evangelical Protestant Methodist/Pietist 1 11 0.37
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 1 518 17.43
Evangelical Lutheran Church in America Mainline Protestant Lutheran 3 1,157 38.93
Jehovah's Witnesses Other Adventist 1 --- ---
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 11 4,077 137.19
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 1 61 2.05
Non-denominational Evangelical Protestant
4 374 12.58
North American Lutheran Church Evangelical Protestant Lutheran 1 --- ---
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 1 34 1.14
Reformed Church in America Mainline Protestant Presbyterian-Reformed 1 134 4.51
Southern Baptist Convention Evangelical Protestant Baptist 2 74 2.49
United Church of Christ Mainline Protestant Presbyterian-Reformed 3 484 16.29
United Methodist Church, The Mainline Protestant Methodist/Pietist 16 2,487 83.69
Wesleyan Church, The Evangelical Protestant Holiness 1 70 2.36
Totals: 76 15,708  

The population of Iroquois County, Illinois was 29,718 in 2010; in 2000 it was 31,334. The total population changed -5.2%. The adherent totals of the religious groups listed above (15,708) included 52.9% 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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