The majority of religious records are still located at individual places of worship. For those congregations no longer in existence, you may wish to check the sources below for more information.
Ohio Church Records (2 February 2019) Retrieved 21 March 2019 from Family Search Wiki
American Baptist Historical Society
Archdiocese of Cincinnati Archives
Archives of Ohio United Methodism, Ohio Wesleyan University
The Archives of the Episcopal Church
Catholic Diocese of Cleveland Archives
Catholic Diocese of Youngstown, Ohio, Kent State University
Church Collections, Bowling Green State University Center for Archival Collections
The Cleveland Jewish Archives, Western Reserve Historical Society
Columbus Jewish Historical Society
Congregational Library & Archives
Disciples of Christ Historical Society
United Church of Christ Archives
Evangelical and Reformed Church Historical Society
Evangelical Lutheran Church of America Region Archives
Mennonite Historical Collections, Bluffton University
Presbyterian Historical Society