Oregon Counties by Population

The most populated counties in Oregon are Multnomah County with 808,098, Washington County at 599,541, Clackamas County with 420,925, Lane County at 382,218, and Marion County with 345,815. You can get the most current Census population data for all 36 Oregon counties, sorted from the most populous counties in Oregon to the least, according to the 2022 American Community Survey.

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