Portland Union Stock Yards opened in 1890, and was organized into a company in 1902 by W. H. H. Morgan. It moved to North Portland in 1909 and was purchased by the United Stockyards Corporation in 1936. Collection includes correspondence, 1931-1936, regarding company purchases and maintenance of trailers, tractors, and dump wagons; receipts and miscellaneous ephemera, 1909-1936, including newspaper articles about the company.