The John C. Ainsworth House is a historic building in Oregon City, Oregon, United States. It was built in 1851. for John C. Ainsworth, the main founder of the Oregon Steam Navigation Company. It is one of the oldest structures in the Portland area and remains in good condition. It is also the only two-story portico in Oregon. The house was added to the National Register of Historic Places in 1973."Department of the Interior, Heritage Conservation and Recreation Service: National Register of Historic Places; Annual Listing of Historic Properties", (February 6, 1979), at 7569.
See also National Register of Historic Places listings in Clackamas County, Oregon Maud and Belle Ainsworth House Belle Ainsworth Jenkins Estate
Further reading Hawkings, William J., III, and William F. Willingham. Classic Houses of Portland, Oregon, 1850–1950. Portland: Timber Press, 1999
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