In 1923, the Wayne County Historical Society was granted a lease from the Delaware and Hudson Co. to use the north half of the building for storage while the Hudson Coal Co. used the south half. The Society opened the museum to the public in 1939. The Department of the Interior designated the building as a National Historic Landmark in 1968, and the Society took over the entire building soon after. An addition to the west was built in 1979 and another to the south in 1993, which houses the replica of The Stourbridge Lion, the first locomotive to operate on commercial tracks in the United States.
Through these many building changes, the Wayne County Historical Society has tried to keep up with the public’s increasing interest in local history while preserving the original building's simple beauty.