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The Mother of All Counties The Lewis County Historical Society and Museum celebrates the storied history of Lewis County Washington. Founded on December 21 1845 Lewis County once stretched at one point from the Cowlitz River to the south and north to Sitka Alaska. Come celebrate our rural heritage of the hop fields and timber industry to the Chehalis and Cowlitz Native American tribes. Discover the History of Lewis County Join us in preserving history Historical Society Membership Become a member of the Lewis County Historical Museum family with a museum membership.