Afro-American Historical & Genealogical Society, Inc., Baltimore Chapter
Baltimore County Genealogical Society
Coalition to Protect Maryland Burial Sites, Inc.
Jewish Genealogy Society of Maryland
Lower Delmarva Genealogical Society serving Delaware, Maryland and Virginia
Maryland Genealogical Society  has some online databases for Baltimore
Maryland Historical Society
Maryland to Kentucky Reunion Society
Maryland Welsh Society
Mid-Atlantic Germanic Society
Order of the First Families of Maryland
Society of The Ark and The Dove was founded in 1910 to perpetuate the memory of the first families of Maryland and to provide opportunities for fellowship for all those who trace their descent from Lord Baltimore and from those who came on the Ark and the Dove in 1634

Additional Resources

Maryland Obituaries enter your Maryland ancestor's name to instantly search the world's largest newspaper archive; over 12 million newspaper pages
Maryland Birth Records
Maryland Marriage Records
Maryland Divorce Records
Maryland Death Records