The following is a list of Hills. county gen.soc.s HILLSBOROUGH COUNTY East Hillsborough Historical Society 605 N. Collins Street, Plant City, FL 33566 Florida Genealogical Society P. O. Box 18624, Tampa, FL 33679-8624 Greater Brandon Genealogical Society P. O. Box 2297, Mango, FL 33550-2297 Deborah Byrd