|Multnomah County Oregon Cities/Towns - Gresham, Portland (County Seat), Troutdale, Wood Village
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Multnomah County is one of 36 counties in the U.S. state of Oregon. In 2016, the county's population was 799,766. The county seat is Portland.
The county was likely named after Native American people first recorded in the journals of the Lewis and Clark Expedition, Mulknomans, who lived in a village on the east side of present-day Sauvie Island. (An alternative theory holds that Multnomah is a corruption of nematlnomaq, meaning down river.)