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The Francis Ermatinger House is located in Oregon City, Oregon, United States. Built by Francis Ermatinger in 1845, it is the oldest house in Clackamas County. Built in the Greek Revival style, the house was originally located near the Willamette River, in the downtown area near Willamette Falls. Francis Ermatinger, an employee of the Hudson's Bay Company, remained in Oregon City after the company abandoned its operations there in 1845.