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Mason City, IA, Micropolitan Statistical Area

Religious Traditions, 2010

7,492 19,752 7,062 200 970 16,273
Evangelical 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 1 366 7.07
Amish Groups, undifferentiated* Evangelical Protestant European Free-Church 1 59 1.14
Assemblies of God Evangelical Protestant Pentecostal 1 185 3.57
Bahá'í Other Other Groups 0 12 0.23
Catholic Church Catholic Catholicism 6 7,062 136.47
Christian Church (Disciples of Christ) Mainline Protestant Baptist 1 168 3.25
Christian Churches and Churches of Christ Evangelical Protestant Baptist 3 467 9.02
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 1 292 5.64
Church of Christ, Scientist Other Christian Science 1 --- ---
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 1 480 9.28
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran 1 98 1.89
Church of the Nazarene Evangelical Protestant Holiness 1 85 1.64
Churches of Christ Evangelical Protestant Baptist 1 45 0.87
Community of Christ Other Latter-day Saints 1 158 3.05
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed 1 119 2.30
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 1 90 1.74
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 1 206 3.98
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 1 264 5.10
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 2 750 14.49
Evangelical Lutheran Church in America Mainline Protestant Lutheran 17 11,784 227.71
Evangelical Lutheran Synod Evangelical Protestant Lutheran 3 171 3.30
Free Methodist Church of North America Evangelical Protestant Holiness 1 72 1.39
Friends United Meeting* Mainline Protestant European Free-Church 1 51 0.99
General Association of Regular Baptist Churches Evangelical Protestant Baptist 2 --- ---
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 1 200 3.86
Jehovah's Witnesses Other Adventist 1 --- ---
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 3 1,080 20.87
Lutheran Congregations in Mission for Christ Evangelical Protestant Lutheran 2 2,062 39.85
Muslim Estimate Other Other Groups 1 308 5.95
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 1 313 6.05
Non-denominational Evangelical Protestant
5 861 16.64
North American Lutheran Church Evangelical Protestant Lutheran 2 --- ---
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 1 90 1.74
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 1 384 7.42
Reformed Church in America Mainline Protestant Presbyterian-Reformed 1 234 4.52
Salvation Army Evangelical Protestant Holiness 1 341 6.59
Seventh-day Adventist Church Evangelical Protestant Adventist 1 114 2.20
Southern Baptist Convention Evangelical Protestant Baptist 2 214 4.14
Unitarian Universalist Association of Congregations Other Liberal 1 12 0.23
United Church of Christ Mainline Protestant Presbyterian-Reformed 1 262 5.06
United Methodist Church, The Mainline Protestant Methodist/Pietist 15 5,865 113.34
United Pentecostal Church International Evangelical Protestant Pentecostal 1 --- ---
Vineyard USA Evangelical Protestant Pentecostal 1 57 1.10
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 1 95 1.84
Totals: 93 35,476  

The population of the Mason City, IA, Micropolitan Statistical Area was 51,749 in 2010; in 2000 it was 54,356. The total population changed -4.8%. The adherent totals of the religious groups listed above (35,476) included 68.6% 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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