browse Madison County Historical Society
Mahoning Valley Historical Society
Mansfield Reformatory Preservation Society
Mansfield-Richland County Public Library
Marion County Historical Society
Marion Union Station Association
Marshallville Historical Society
Mary Lou Johnson-Hardin County District Library
Massillon Museum Foundation, Inc.
McKinley Birthplace Home and Research Center
McKinley Museum and National Memorial
Medical Heritage Center, Ohio State University
Mercer County Historical Museum
Methodist Theological School in Ohio
Missionaries of the Precious Blood
Montgomery County Historical Society
Moreland Hills Historical Society
Mount Vernon Nazarene University
Munroe Falls Historical Society
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