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Welcome to Columbia County ...Time Zone: Columbia County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time. The community of Dayton is the Seat for Columbia County. Columbia County was founded in 1875 and was created by taking area from Walla Walla County. From the Census Estimates for 2019, <1> Columbia had a population of 4,023 people. This is a decrease of 1.35% since the last Census (which gave a population of 4,078 people in 2010). At the time of the 2010 Census, Columbia represented 0.06% of the total population of Washington. Websites of Interest ...
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This page was last modified/updated: 26 Feb 2024