Updated 6-22-19

Calvert County Historical Society

P.O Box 358 

Prince Frederick, MD 20678

http://www.calverthistory.org/

Howard County Genealogy Society

P.O Box 274 

Columbia, MD 21045

https://hcgsmd.org/

Maryland Genealogical Society 
201 West Monument Street 
Baltimore, MD 21201

Maryland Historical Society

201 West Monument Street 
Baltimore, MD 21201

https://www.mdhs.org/