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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
Washington County is a county located in the northeastern part of the U.S. state of Oklahoma. As of the 2020 census, the population was 52,455.[1] Its county seat is Bartlesville. Named for President George Washington, it is the second smallest county in Oklahoma in total area, adjacent to the largest county in Oklahoma, Osage County.
Washington County comprises the Bartlesville, OK Micropolitan Statistical Area, which is also included in the Tulsa-Muskogee-Bartlesville, OK Combined Statistical Area. It is located along the border with Kansas.
Timeline
| Date | Event | Source
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| 1900 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1907 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1907 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1907 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1907 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1907 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1907 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1908 | 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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| 1907 | 12,813
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| 1910 | 17,484
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| 1920 | 27,002
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| 1930 | 27,777
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| 1940 | 30,559
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| 1950 | 32,880
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| 1960 | 42,347
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| 1970 | 42,277
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| 1980 | 48,113
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| 1990 | 48,066
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Research Tips
External links
www.co.washington.ok.us/
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