County Membership Report
 Maps and Reports > Select Counties >
Search Maps & Reports:

Middlesex County (Connecticut)

Religious Traditions, 2010

3,978 974 15,015 46,800 85 2,921 95,903
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 % Change
Evangelical Lutheran Church in America Mainline Protestant Lutheran +1 +31 +1.3%
United Methodist Church, The Mainline Protestant Methodist/Pietist +1 -282 -12.8%
American Baptist Churches in the USA Mainline Protestant Baptist 0 -186 -17%
Bahá'í Other Other Groups 0 +25 +131.6%
Catholic Church Catholic Catholicism 0 -12833 -21.5%
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 0 -45 -80.4%
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 0 +268 +67.8%
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian-Reformed 0 -252 -34.5%
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 0 -1211 -30.6%
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 0 -201 -59.5%
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 0 -11 -4.2%
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 0 +43 +12%
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) 0 +17 +25%
Salvation Army Evangelical Protestant Holiness 0 0 0%
Seventh-day Adventist Church Evangelical Protestant Adventist 0 +3 +8.6%
United Church of Christ Mainline Protestant Presbyterian-Reformed 0 -1853 -22.7%
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed -1 -245 -63.1%
Southern Baptist Convention Evangelical Protestant Baptist -1 -105 -89.7%
Assemblies of God Evangelical Protestant Pentecostal -2 +24 +7.1%
African Methodist Episcopal Church Black Protestant Methodist/Pietist --- --- ---
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist --- --- ---
Church of Christ, Scientist Other Christian Science --- --- ---
Church of God in Christ Black Protestant Pentecostal --- --- ---
Conservative Judaism Other Judaism --- --- ---
Elim Fellowship Evangelical Protestant Pentecostal --- --- ---
Friends General Conference and Friends United Meeting, dually aligned meetings* Mainline Protestant European Free-Church --- --- ---
Full Gospel Baptist Church Fellowship Black Protestant Baptist --- --- ---
Jehovah's Witnesses Other Adventist --- --- ---
Muslim Estimate Other Other Groups --- --- ---
National Baptist Convention, USA, Inc. Black Protestant Baptist --- --- ---
Non-denominational Evangelical Protestant
--- --- ---
Reform Judaism Other Judaism --- --- ---
Seventh Day Baptist General Conference, USA and Canada Evangelical Protestant Baptist --- --- ---
United Pentecostal Church International Evangelical Protestant Pentecostal --- --- ---
Totals: -2 -16813 -20.8%

The population of Middlesex County, Connecticut was 155,071 in 2000; in 1990 it was 143,196. The total population changed 8.3%. The adherent totals of the religious groups listed above (84,241) included 54.3% of the total population in 2000.

The population of Middlesex County, Connecticut was 165,676 in 2010; in 2000 it was 155,071. The total population changed 6.8%. The adherent totals of the religious groups listed above (69,773) included 42.1% 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.

Bookmark and Share