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Winnebago County, Iowa

Religious Traditions, 2010

917   7,247   810 5 1,887
Evangelical Protestant Black Protestant Mainline Protestant Orthodox 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 1 107 8.8
Assemblies of God Evangelical Protestant Pentecostal 1 22 1.8
Association of Free Lutheran Congregations Evangelical Protestant Lutheran --- --- ---
Catholic Church Catholic Catholicism 3 1,225 101.1
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran 3 120 9.9
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed --- --- ---
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 1 194 16.0
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 1 289 23.8
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 1 150 12.4
Evangelical Lutheran Church in America Mainline Protestant Lutheran 11 6,076 501.2
Evangelical Lutheran Synod Evangelical Protestant Lutheran 6 543 44.8
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 1 45 3.7
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 1 88 7.3
North American Baptist Conference Evangelical Protestant Baptist 1 120 9.9
Reformed Church in America Mainline Protestant Presbyterian-Reformed 1 412 34.0
Seventh-day Adventist Church Evangelical Protestant Adventist 1 21 1.7
United Methodist Church, The Mainline Protestant Methodist/Pietist 5 1,484 122.4
Totals: 38 10,896  

The population of Winnebago County, Iowa was 12,122 in 1990; in 1980 it was 13,010. The total population changed -6.8%. The adherent totals of the religious groups listed above (10,896) included 89.9% 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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