The Point Defiance Historical Society is not in Tacoma. It is based in Gig Harbor, Washington:
5400 Point Fosdick Drive NW
Gig Harbor, WA 98335
The society preserves the history of the Point Defiance area—including the park, zoo, pagoda, and surrounding neighborhoods—though its office is across the Narrows in Gig Harbor. Tacoma's own historical society is the Tacoma Historical Society (919 Pacific Ave, Tacoma).