Founded in 1952, this all-volunteer, non-profit organization works to fulfill its mission of preserving and promoting the County’s long and diverse history.

Upcoming Events

Virtual Lecture September 10, 2020

Old World Master Paintings: Riversdale’s Famous Art Works

Maryland Milestones, in partnership with the Prince George’s County Historical Society, will present an illustrated lecture on the outstanding collection of Old World Master Paintings that were housed at Riversdale two centuries ago

A message about Coronavirus COVID-19

Due to the Coronavirus pandemic, the Frederick DeMarr Library of County History will be closed on Saturday, March 14, 2020, and until further notice. We will attempt to answer any questions sent to info@pghistory.org. We appreciate your understanding.