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Cowlitz County Washington Last Updated: 08/11/2026 |
| Cowlitz County is a county located in Washington State. According to the 2020 census, the county has a population of 110,730. The county seat is Kelso, and the largest city is Longview. Cowlitz County has long been an important manufacturing center for the state, encompassing the lumber, woodworking, and paper manufacturing industries. | |
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