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New London County (Connecticut)

Religious Traditions, 2010

9,320 2,594 18,993 84,765 2,456 5,022 150,905
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
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed +3 +339 +23.5%
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist +2 -2262 -79.1%
Assemblies of God Evangelical Protestant Pentecostal +2 +271 +31.4%
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints +2 +938 +98.7%
Seventh-day Adventist Church Evangelical Protestant Adventist +2 +70 +21.2%
Southern Baptist Convention Evangelical Protestant Baptist +2 -1088 -70.8%
American Baptist Churches in the USA Mainline Protestant Baptist +1 -661 -11.7%
Christian and Missionary Alliance, The Evangelical Protestant Holiness +1 +135 +43%
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 0 +167 +65.2%
Church of the Nazarene Evangelical Protestant Holiness 0 -173 -82%
Evangelical Lutheran Church in America Mainline Protestant Lutheran 0 -333 -24.6%
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 0 -478 -37.6%
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 0 -31 -7.7%
Salvation Army Evangelical Protestant Holiness 0 -169 -23%
Seventh Day Baptist General Conference, USA and Canada Evangelical Protestant Baptist 0 -37 -69.8%
Unitarian Universalist Association of Congregations Other Liberal 0 +36 +13%
Catholic Church Catholic Catholicism -1 +11352 +15.5%
Churches of Christ Evangelical Protestant Baptist -1 -99 -44.2%
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism -1 -1993 -35.5%
United Methodist Church, The Mainline Protestant Methodist/Pietist -1 -647 -23.7%
Christian Brethren Evangelical Protestant Ind. Fundamentalist -2 --- ---
Conservative Baptist Association of America Evangelical Protestant Baptist -2 --- ---
United Church of Christ Mainline Protestant Presbyterian-Reformed -4 -1528 -23.3%
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist --- --- ---
Totals: +3 +3809 +3.6%

The population of New London County, Connecticut was 238,409 in 1980. The adherent totals of the religious groups listed above (110,058) included 46.2% of the total population in 1980.

The population of New London County, Connecticut was 274,055 in 2010; in 2000 it was 259,088. The total population changed 5.8%. The adherent totals of the religious groups listed above (123,150) included 44.9% 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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