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HOME ABOUT US UCHS FACILITIES MARKETPLACE ARCHIVES COLLECTIONS More Exploring Union County39s Past to Inform the Present and Future Welcome. For over a hundred years the Union County Historical Society has promoted the history of Union County Pennsylvania through educational programs displays publications events and celebrations. We invite visitors to explore our research library at the courthouse which includes genealogical resources history publications and microfilm newspaper archive as well as providing research services. The Society offers programs at the newly restored Gallery at 15 N.