The society participates in joint marketing with the Delaware Tourism Office, the Greater Wilmington Convention & Visitors Bureau, and the Brandywine Museums & Gardens Alliance.

The main museum consists of two permanent exhibit halls in a converted 1941 art deco Woolworth's store, one of two that used to operate on Market Street.

Willingtown Square is a collection of buildings relocated from other sections of downtown to make way for high rise construction.

[2] The buildings' interiors serve as office and meeting space for the society but patrons can access the courtyard and grounds.

The collection includes work on Delaware genealogy, maps, and Underground Railroad as well as a letter from George Washington to Caesar Rodney.