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Religious Families

Islam Family:

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Adherence Rates Over Time

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Islam Family

Islam is the religion founded by the Prophet Muhammad (570-632), who is believed by followers to be the final prophet. The word "Islam" means "submission." Muslims follow the sacred text of the Koran, stress the oneness of God, and practice the Five Pillars: praying, fasting during Ramadan, almsgiving, pilgrimage, and a testimony of faith. The two main branches of Islam are Sunni and Shi'ite. This split occurred in 632 due to different opinions on leadership succession. Following the passage of the 1965 Immigration and Nationality Act, which allowed for more immigration from Muslim majority countries, the Islamic population has grown rapidly in the U.S.

Maps: Islam Family1

Adherence Rate per 1,000 (2020)

Congregations (2020)

Top 5 Islam Family States (2020)1 [View all states]

Rank State Adherents Adherence Rate
1 Illinois 473,792 37.00
2 New York 724,475 35.90
3 New Jersey 321,652 34.60
4 Maryland 188,914 30.60
5 Michigan 241,828 24.00

Top 5 Islam Family Counties (2020)1 [View all counties]

Rank County Adherents Adherence Rate
1 Harding County, New Mexico 463 704.70
2 Petersburg city, Virginia 3,988 119.20
3 Passaic County, New Jersey 61,580 117.50
4 Orleans County, New York 4,144 102.70
5 Fairfax city, Virginia 2,216 91.80

Top 5 Islam Family Metro Areas (2020)1 [View all Metro Areas]

Islam Family: Adherence Rates (1980 - 2020)1

Group Tradition Adh. Rate 2020 Adh. Rate 2010 Adh. Rate 2000 Adh. Rate 1990 Adh. Rate 1980
Muslim Estimate Islam 13.44 8.42 5.54


1 The 2020 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include data for 372 religious bodies or groups. Of these, the ASARB was able to gather data on congregations and adherents for 217 and on congregations only for 155. [More information on the data sources]

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