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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
Adams County is a county in the U.S. state of Washington. As of the 2020 census, the population was 20,613. The county seat is at Ritzville, and its largest city is Othello. The county was formed out of Whitman County in November 1883 and is named after John Adams, the second President of the United States.
Adams County's two most populous cities are Ritzville and Othello. Ritzville is located in the northeastern corner of the county at the junction of I-90 and US 395, making it a popular stop for travelers. Ritzville is an hour's drive from Spokane. Othello is located in the southwestern panhandle of the county.
Timeline
| Date | Event | Source
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| 1883 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1884 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1885 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1890 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1890 | 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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| 1891 | Marriage 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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| 1890 | 2,098
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| 1900 | 4,840
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| 1910 | 10,920
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| 1920 | 9,623
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| 1930 | 7,719
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| 1940 | 6,209
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| 1950 | 6,584
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| 1960 | 9,929
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| 1970 | 12,014
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| 1980 | 13,267
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| 1990 | 13,603
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