Idanha is a city on the Marion County/Linn County line in Oregon, United States, on Oregon Route 22 and the Santiam River. The population …Idanha is a city on the Marion County/Linn County line in Oregon, United States, on Oregon Route 22 and the Santiam River. The population was 156 at the 2020 census. The Marion County portion of Idanha is part of the Salem Metropolitan Statistical Area, while the Linn County portion is part of the Albany–Lebanon Micropolitan Statistical Area.
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