Oregon City is the county seat of Clackamas County, Oregon, United States, located on the Willamette River near the southern limits of th…Oregon City is the county seat of Clackamas County, Oregon, United States, located on the Willamette River near the southern limits of the Portland metropolitan area. As of the 2020 census, the city population was 37,572. Established in 1829 by the Hudson's Bay Company, in 1844 it became the first U.S. city west of the Rocky Mountains to be incorporated.
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