The heritage of Jefferson County is rich and diverse. The Jefferson County Historical Society Museum is located in the authentic Victorian seaport of Port Townsend, Washington. The Museum is located in Port Townsend's historic City Hall, dedicated in 1892. It occupies the original Police Department, Court Room, City Jail and Fire Hall. The Museum retains the character of this historic structure which still houses the City's Council Chambers. The Court Room with its original woodwork, the dramatic City Jail and the high-ceilinged Fire Hall all contribute to a feeling of history as one tours the Museum. The Museum honors the people of Jefferson County through its collection of artifacts, archives, oral histories, and photographs.

Founded in 1952, grew into more and more of the City Hall building as city officials moved out to more modern facilities.