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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
Cowlitz County is a county located in the U.S. state of Washington. As of the 2020 census, its population was 110,730. The county seat is Kelso, and its largest city is Longview. The county was formed in April 1854. Its name derives from the anglicized version of the Cowlitz Indian term Cow-e-liske, meaning either 'river of shifting sands' or 'capturing the medicine spirit.' Cowlitz comprises the Longview, WA Metropolitan statistical area, which is also included in the Portland-Vancouver-Salem, OR-WA Combined statistical area.
Timeline
| Date | Event | Source
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| 1854 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1854 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1854 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1860 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1860 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1872 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1880 | 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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| 1860 | 406
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| 1870 | 730
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| 1880 | 2,062
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| 1890 | 5,917
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| 1900 | 7,877
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| 1910 | 12,561
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| 1920 | 11,791
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| 1930 | 31,906
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| 1940 | 40,155
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| 1950 | 53,369
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| 1960 | 57,801
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| 1970 | 68,616
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| 1980 | 79,548
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| 1990 | 82,119
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