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Columbia County
Sign in to saveAlso known as Columbia County, Washington, Columbia County, WA
county in Washington, United States
Key facts
- Country
- United States
- State
- Washington
- Founded
- November 11, 1875
- Named after
- Columbia River
- Seat
- Dayton
- Largest city
- Dayton
- Total
- 873 sq mi (2,260 km )
- Land
- 869 sq mi (2,250 km )
- Water
- 4.9 sq mi (13 km ) 0.6%
- Estimate 2025
- 4,141
- Density
- 4.6/sq mi (1.8/km )
- Time zone
- UTC−8 ( Pacific )
- Summer dst
- UTC−7 ( PDT )
- Congressional district
- 5th
- Website
- www .columbiaco .com
via Wikipedia infobox
~9 min read
Encyclopedic overview
Columbia County is a county located in the U.S. state of Washington. As of the 2020 census, the population was 3,952, making it the second-least populous county in Washington. The county seat and largest city is Dayton. The county was created out of Walla Walla County on November 11, 1875, and is named after the Columbia River (which does not flow through the county). Columbia County is included in the Walla Walla, WA Metropolitan Statistical Area.
Geography
Excerpted from Wikipedia’s “Columbia County” article, available under the CC BY-SA 4.0 licence.