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- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
- the text in this section is copied from an article in Wikipedia
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. Columbia County is included in the Walla Walla, WA Metropolitan Statistical Area.
Timeline
| Date | Event | Source
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| 1864 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1874 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1875 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1876 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1878 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1880 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1890 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1891 | Birth records recorded | Source:Red Book: American State, County, and Town Sources
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Population History
- source: Source:Population of States and Counties of the United States: 1790-1990
| Census Year | Population
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| 1880 | 7,103
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| 1890 | 6,709
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| 1900 | 7,128
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| 1910 | 7,042
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| 1920 | 6,093
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| 1930 | 5,325
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| 1940 | 5,549
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| 1950 | 4,860
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| 1960 | 4,569
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| 1970 | 4,439
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| 1980 | 4,057
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| 1990 | 4,024
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