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Religion in Connecticut

The United States had rich and diverse religious cultures, and the freedom to practice beliefs has helped give rise to a highly unique religious pluralism and freedom. Connecticut is a state in New England region, with Christianity being the majority religion and Protestantism as its largest branch. 

Despite Protestants having the majority in  Connecticut, it has a good percentage of  Roman Catholics. Since the 1990s, the religious share of Christians has decreased, while Hinduism, Buddhism, Islam, Sikhism, and other religions have spread, mainly from immigration.

also read about Race and Ethnicity in Connecticut

Connecticut Religion Percentage

Christianity is the largest religion followed by 70% of the population. The largest Christian denomination in Connecticut is Protestants (35%) followed by Roman Catholics (33%), Mormonism (1%), Eastern Orthodoxy (1%), and Other Christians (1%).

23% of the population don’t follow or adhere to any faith or religion and the rest 7% follow other non-Christian-based religions.

Other Religions include Hinduism, Buddhism, Jews, Islam, and other smaller faiths.

Religion/Affiliations Percentage
Christianity  70%
 – Protestantism  – 35%
 – Roman Catholicism  – 33%
 – Mormonism  – 1%
 – Eastern Orthodoxy  – 1%
 – Jehovah’s Witnesses  -< 1%
 – Other Christian  – 1%
Other Religion 7%
  Judaism  3%
  Islam  1%
  Buddhism  1%
  Hinduism  1%
  Other religion  1%
  No religion  23%
  Don’t know  1%

Source: Pew Research Center

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Christianity in Connecticut

Christianity with 70% followers is the largest in Connecticut. All Protestant denominations accounted for 35% of the population, Catholics are 33% of the population, and are the largest individual denomination if Protestantism is divided into various denominations instead of being counted as a single category. 

Rest include Mormons,  Eastern Orthodoxy, Jehovah’s Witnesses, and other smaller denominations. 

Christianity AffiliationsPercentage
Protestantism 35%
– Evangelical Protestant– 13%
– Mainline Protestant– 17%
– Black church– 5%
Roman Catholicism 33%
Mormonism 1%
Eastern Orthodoxy 1%
Jehovah’s Witnesses <1%
Other Christians 1%

Protestantism in Connecticut

Among Christians in Connecticut, Protestantism is the largest group comprising about 35% of the state’s population. Protestantism in the United States has branched out into several branches, denominations, and various interdenominational and related movements. 

Protestants by tradition can be further classified into three main denominations. Mainline Protestants are the largest and followed by 27% of the population, Next are Evangelicals (13%) and Historically Black Protestants (5%)

Protestants Affiliation% of  population
Mainline  Protestant27%
Evangelical Protestant13%
Black church5%

Protestantism is also comprised of numerous denominational families (e.g., Baptist, Methodist, and Pentecostal) that fit into one or more of the traditions. According to the Association of Religion Data Archives (ARDA), In 2020 The largest Protestant denomination by the number of adherents is as follows

#Protestant ChurchesTraditionFamilyAdherents
1Non-denominational Christian ChurchesEvangelical Other 171,418
2United Church of ChristMainline Congregationalists 63,868
3American Baptist Churches in the U.S.A.Mainline Baptist 44,638
4Episcopal ChurchMainline Anglican/Episcopal 43,373
5United Methodist ChurchMainline Methodist34,848
6National Baptist Convention, USA, Inc.Black ProtestantBaptist 25,660

read about  Protestants in the United States


Catholics in Connecticut

Catholic Church at 23 % of the state population is the second largest religious grouping, after Protestantism. According to the Association of Religion Data Archives, the largest Christian denomination, by the number of adherents in 2020 was the Catholic Church, with 1,024,927 adherents. Hartford is the seat of the Roman Catholic Archdiocese of Hartford, which is sovereign over the Diocese of Bridgeport and the Diocese of Norwich.

Since the 1990s, the religious share of Christians has decreased, while Hinduism, Buddhism, Islam, Sikhism, and other religions have spread, mainly from immigration. Other Religions form 7% of the Connecticut population and include Hinduism, Buddhism, Jews, Islam, and other smaller faiths.

Jewish congregations had 108,280 (3.2%) members in 2000. The Jewish population is concentrated in the towns near Long Island Sound between Greenwich and New Haven, in Greater New Haven, and in Greater Hartford, especially the suburb of West Hartford.

also read about Population in Connecticut


Note: The US census does not contain questions about one’s religious affiliation. Our Article is based on surveys conducted by various institutions and agencies.

Religion in Connecticut 2024 | Christianity in Connecticut