|Cowlitz County Washington Cities/Towns - Castle Rock, Kalama, Kelso (County Seat), Longview, Woodland
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Cowlitz County is a county located in the U.S. state of Washington. As of July 2016 its population was 105,160. The county seat is at Kelso.
Its name derives from the anglicized version of the Cowlitz language term, Cow-e-liske, meaning either "river of shifting sands" or "capturing the medicine spirit." It was formed on April 21, 1854.