From the record
“United States Post Office - Port Townsend Main is a Richardsonian Romanesque building completed in 1893 on a bluff above Port Townsend's waterfront. It was intended to serve as a Federal building that would include a customhouse serving Port Townsend's incipient role in world trade.”
Wikipedia article United States Post Office - Port Townsend Main, CC BY-SA 4.0.
One of 75 National Register listings published here for Jefferson County · listed in 1991 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service