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New Haven County (Connecticut)

Religious Traditions, 2010

33,484 6,471 52,851 304,677 3,731 19,943 441,320
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 Adherence Rate
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist 8 7,705 9.58
Catholic Church Catholic Catholicism 106 368,313 457.98
Advent Christian Church Evangelical Protestant Adventist 2 178 0.22
Apostolic Christian Churches (Nazarene) Evangelical Protestant European Free-Church 1 22 0.03
Assemblies of God Evangelical Protestant Pentecostal 22 3,077 3.83
Black Baptists Estimate Evangelical Protestant Baptist --- 19,391 24.11
Christian and Missionary Alliance, The Evangelical Protestant Holiness 5 624 0.78
Christian Brethren Evangelical Protestant Ind. Fundamentalist 4 782 0.97
Christian Churches and Churches of Christ Evangelical Protestant Baptist 4 182 0.23
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 1 240 0.30
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 4 444 0.55
Church of God of Prophecy Evangelical Protestant Pentecostal 3 103 0.13
Church of the Nazarene Evangelical Protestant Holiness 1 100 0.12
Churches of Christ Evangelical Protestant Baptist 8 758 0.94
Conservative Baptist Association of America Evangelical Protestant Baptist 1 --- ---
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 5 536 0.67
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 4 640 0.80
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 1 54 0.07
Independent, Charismatic Churches Evangelical Protestant Pentecostal 6 3,200 3.98
Independent, Non-Charismatic Churches Evangelical Protestant
3 1,500 1.87
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 7 2,412 3.00
Mennonite Church USA Evangelical Protestant European Free-Church 1 80 0.10
North American Baptist Conference Evangelical Protestant Baptist 1 37 0.05
Salvation Army Evangelical Protestant Holiness 4 303 0.38
Seventh-day Adventist Church Evangelical Protestant Adventist 8 1,136 1.41
Southern Baptist Convention Evangelical Protestant Baptist 2 517 0.64
American Baptist Churches in the USA Mainline Protestant Baptist 23 10,770 13.39
Christian Church (Disciples of Christ) Mainline Protestant Baptist 2 246 0.31
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 45 15,036 18.70
Evangelical Lutheran Church in America Mainline Protestant Lutheran 14 6,090 7.57
Friends (Quakers) Mainline Protestant European Free-Church 1 96 0.12
Latvian Evangelical Lutheran Church in America Mainline Protestant Lutheran 1 30 0.04
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 2 231 0.29
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 4 685 0.85
United Church of Christ Mainline Protestant Presbyterian-Reformed 48 26,033 32.37
United Methodist Church, The Mainline Protestant Methodist/Pietist 22 9,966 12.39
Apostolic Catholic Assyrian Church of the East, North American Dioceses Orthodox Eastern Liturgical (Orthodox) 0 109 0.14
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 4 --- ---
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) 4 --- ---
Church of Christ, Scientist Other Christian Science 5 --- ---
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 6 1,749 2.17
Jewish Other Judaism 25 34,250 42.59
Unitarian Universalist Association of Congregations Other Liberal 4 791 0.98
Totals: 422 518,416  

The population of New Haven County, Connecticut was 804,219 in 1990; in 1980 it was 761,337. The total population changed 5.6%. The adherent totals of the religious groups listed above (518,416) included 64.5% 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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