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Population Review

What is the largest county in Oregon?

Multnomah County is the largest county in Oregon with a population of 803,863, according to Census ACS 5-Year.

Context

Oregon has 36 counties.

Top 10

Multnomah County803,863
Washington County600,266
Clackamas County422,308
Lane County382,628
Marion County346,532

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Oregon full demographic profileCities in OregonAll US states

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Frequently Asked Questions

Multnomah County is the largest county in Oregon with a population of 803,863, according to Census ACS 5-Year.