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Suffolk County (Massachusetts)

Religious Traditions, 2010

48,562 4,176 20,380 332,744 7,693 29,094 279,374
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
Albanian Orthodox Diocese of America Orthodox Eastern Liturgical (Orthodox) 1 125 0.18
American Baptist Churches in the USA Mainline Protestant Baptist 35 9,115 13.21
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox Eastern Liturgical (Orthodox) 1 2,468 3.58
Assemblies of God Evangelical Protestant Pentecostal 14 1,610 2.33
Bahá'í Other Other Groups 1 288 0.42
Buddhists Other Other Groups 9 --- ---
Catholic Church Catholic Catholicism 73 310,150 449.62
Christian and Missionary Alliance, The Evangelical Protestant Holiness 5 582 0.84
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 2 3,975 5.76
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 8 1,438 2.08
Church of God of Prophecy Evangelical Protestant Pentecostal 5 453 0.66
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 3 500 0.72
Church of the Nazarene Evangelical Protestant Holiness 7 775 1.12
Churches of Christ Evangelical Protestant Baptist 3 434 0.63
Conservative Baptist Association of America Evangelical Protestant Baptist 5 950 1.38
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 3 1,285 1.86
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 2 346 0.50
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 25 9,405 13.63
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 1 187 0.27
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 1 85 0.12
Evangelical Lutheran Church in America Mainline Protestant Lutheran 6 747 1.08
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 1 136 0.20
Free Methodist Church of North America Evangelical Protestant Holiness 2 88 0.13
Friends (Quakers) Mainline Protestant European Free-Church 1 51 0.07
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 2 975 1.41
Greek Orthodox Archdiocese of Vasiloupulis Orthodox Eastern Liturgical (Orthodox) 2 310 0.45
Hindus Other Other Groups 4 --- ---
Holy Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) 2 605 0.88
Independent, Charismatic Churches Evangelical Protestant Pentecostal 1 2,000 2.90
International Churches of Christ Evangelical Protestant Baptist 1 6,162 8.93
Jewish Other Judaism 22 24,700 35.81
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 2 642 0.93
Mennonite Church USA Evangelical Protestant European Free-Church 2 187 0.27
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 1 57 0.08
Muslim Estimate Other Other Groups 8 13,587 19.70
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 1 149 0.22
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) 2 257 0.37
Orthodox Church in America: Albanian Orthodox Archdiocese Orthodox Eastern Liturgical (Orthodox) 2 2,750 3.99
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed 1 27 0.04
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 5 498 0.72
Russian Orthodox Church Outside of Russia Orthodox Eastern Liturgical (Orthodox) 1 --- ---
Salvation Army Evangelical Protestant Holiness 7 1,206 1.75
Seventh-day Adventist Church Evangelical Protestant Adventist 9 3,605 5.23
Southern Baptist Convention Evangelical Protestant Baptist 16 4,077 5.91
Syriac Orthodox Church of Antioch Orthodox Eastern Liturgical (Orthodox) 1 300 0.43
Ukrainian Orthodox Church of the USA Orthodox Eastern Liturgical (Orthodox) 1 900 1.30
Unitarian Universalist Association of Congregations Other Liberal 8 1,599 2.32
United Church of Christ Mainline Protestant Presbyterian-Reformed 18 2,842 4.12
United Methodist Church, The Mainline Protestant Methodist/Pietist 10 1,362 1.97
Totals: 343 413,990  

The population of Suffolk County, Massachusetts was 689,807 in 2000; in 1990 it was 663,906. The total population changed 3.9%. The adherent totals of the religious groups listed above (413,990) included 60.0% of the total population in 2000.

* 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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