Prehistoric cultural affiliation(s) include Cayuse and Windust Phase dating back to 8999 BC.
Many famous people are associated with these Walla Walla County historic places including Marcus Whitman, John F. Boyer, Miles Conway Moore, William G. Preston and George Ludwigs.
Some of the country's most noteable architects helped create the Walla Walla County places including F.P. Allen, E.R. Smith, George Harding, Missour Valley Bridge & Iron Co., G.W. Babcock, Hendricks & Tobbey Co. Bennes, Henry Osterman, Kelly--Atkinson Construction Co., Osterman & Siebert and Architectural Off./Engineering Dept.. Prominent architectural styles found in Walla Walla Country are Bungalow/Craftsman, Queen Anne and Romanesque.