Prehistoric cultural affiliation(s) include Samish and Kwakiuti dating back to 2999 BC.
The famous person Robert Moran is associated with one of more of the San Juan County historic places.
Some of the country's most noteable architects helped create the San Juan County places including Robert Moran, Edwin Von Bogart, Gray, Sidney, R.S., W.E. Sutherland, Viereck family, Michael S. Donohue, Friedrich Krumdiak, Paul Kirk, Lee Noderer and Potter & Merrill. Prominent architectural styles found in San Juan Country are Bungalow/Craftsman, Greek Revival and Early Commercial.