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Hamilton County (Iowa)

Religious Traditions, 2010

2,939 5,422 1,433 2 5,877
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
United Methodist Church, The Mainline Protestant Methodist/Pietist 7 2,123 135.46
Evangelical Lutheran Church in America Mainline Protestant Lutheran 3 1,873 119.50
Lutheran Congregations in Mission for Christ Evangelical Protestant Lutheran 3 1,085 69.23
United Church of Christ Mainline Protestant Presbyterian-Reformed 3 690 44.02
Catholic Church Catholic Catholicism 2 1,433 91.43
Christian Churches and Churches of Christ Evangelical Protestant Baptist 2 601 38.35
American Baptist Churches in the USA Mainline Protestant Baptist 1 354 22.59
Association of Free Lutheran Congregations Evangelical Protestant Lutheran 1 --- ---
Christian and Missionary Alliance, The Evangelical Protestant Holiness 1 464 29.61
Christian Brethren Evangelical Protestant Ind. Fundamentalist 1 --- ---
Christian Church (Disciples of Christ) Mainline Protestant Baptist 1 234 14.93
Churches of Christ Evangelical Protestant Baptist 1 10 0.64
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 1 90 5.74
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 1 52 3.32
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 1 14 0.89
General Association of Regular Baptist Churches Evangelical Protestant Baptist 1 --- ---
Jehovah's Witnesses Other Adventist 1 --- ---
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 1 440 28.07
Non-denominational Evangelical Protestant
1 235 14.99
North American Lutheran Church Evangelical Protestant Lutheran 1 --- ---
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 1 96 6.13
Bahá'í Other Other Groups 0 2 0.13
Totals: 35 9,796  

The population of Hamilton County, Iowa was 15,673 in 2010; in 2000 it was 16,438. The total population changed -4.7%. The adherent totals of the religious groups listed above (9,796) included 62.5% 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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