Using data from the 1980 Churches and Church Membership Study, this list ranks U.S. counties on the highest total number of adherents and the highest percent of the population in Mainline Protestant denominations. You can sort the list by clicking on the column headings. Most historically African American denominations are not included in the 1980 congregation and membership totals.

Congregational "adherents" include all full members, their children, and others who regularly attend services.

[More information on the data source]

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