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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
Catholic Church Catholic Catholicism 107 383,554 503.79
United Church of Christ Mainline Protestant Presbyterian-Reformed 49 27,759 36.46
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 47 24,941 32.76
United Methodist Church, The Mainline Protestant Methodist/Pietist 23 10,327 13.56
American Baptist Churches in the USA Mainline Protestant Baptist 22 9,910 13.02
Evangelical Lutheran Church in America Mainline Protestant Lutheran 17 8,214 10.79
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist 8 7,637 10.03
Jewish Other Judaism 14 5,788 7.60
Assemblies of God Evangelical Protestant Pentecostal 13 3,134 4.12
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 7 2,918 3.83
Salvation Army Evangelical Protestant Holiness 4 1,733 2.28
Seventh-day Adventist Church Evangelical Protestant Adventist 6 973 1.28
Unitarian Universalist Association of Congregations Other Liberal 4 684 0.90
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 4 619 0.81
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 3 557 0.73
Christian Brethren Evangelical Protestant Ind. Fundamentalist 3 550 0.72
Christian Methodist Episcopal Church Black Protestant Methodist/Pietist 2 505 0.66
Churches of Christ Evangelical Protestant Baptist 6 412 0.54
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 5 366 0.48
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 2 352 0.46
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 1 321 0.42
Advent Christian Church Evangelical Protestant Adventist 2 317 0.42
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 2 309 0.41
Christian Church (Disciples of Christ) Mainline Protestant Baptist 2 293 0.38
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 5 253 0.33
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 2 180 0.24
Christian and Missionary Alliance, The Evangelical Protestant Holiness 2 160 0.21
Christian Churches and Churches of Christ Evangelical Protestant Baptist 2 145 0.19
Church of the Nazarene Evangelical Protestant Holiness 1 127 0.17
Southern Baptist Convention Evangelical Protestant Baptist 2 102 0.13
Mennonite Church Evangelical Protestant European Free-Church 1 93 0.12
Friends (Quakers) Mainline Protestant European Free-Church 1 82 0.11
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed 1 82 0.11
Conservative Baptist Association of America Evangelical Protestant Baptist 1 68 0.09
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 1 50 0.07
North American Baptist Conference Evangelical Protestant Baptist 1 45 0.06
Apostolic Christian Churches (Nazarene) Evangelical Protestant European Free-Church 1 20 0.03
Apostolic Catholic Assyrian Church of the East, North American Dioceses Orthodox Eastern Liturgical (Orthodox) 0 0 0.00
Black Baptists Estimate Evangelical Protestant Baptist 0 0 0.00
Church of Christ, Scientist Other Christian Science 0 0 0.00
Church of God of Prophecy Evangelical Protestant Pentecostal 0 0 0.00
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 0 0 0.00
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 0 0 0.00
Independent, Charismatic Churches Evangelical Protestant Pentecostal 0 0 0.00
Independent, Non-Charismatic Churches Evangelical Protestant
0 0 0.00
Latvian Evangelical Lutheran Church in America Mainline Protestant Lutheran 0 0 0.00
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) 0 0 0.00
Totals: 374 493,580  

The population of New Haven County, Connecticut was 761,337 in 1980. The adherent totals of the religious groups listed above (493,580) included 64.8% of the total population in 1980.

* 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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