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- the text in this section is copied from an article in Wikipedia
Jefferson County (county code JF) is a county located in the U.S. state of Kansas. At the 2020 census, the county population was 18,368. Its county seat is Oskaloosa, and its most populous city is Valley Falls.
Timeline
| Date | Event | Source
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| 1854 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1855 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1855 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1855 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1858 | Court 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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| 1870 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1892 | 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 | 4,459
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| 1870 | 12,526
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| 1880 | 15,563
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| 1890 | 16,620
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| 1900 | 17,533
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| 1910 | 15,826
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| 1920 | 14,750
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| 1930 | 14,129
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| 1940 | 12,718
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| 1950 | 11,084
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| 1960 | 11,252
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| 1970 | 11,945
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| 1980 | 15,207
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| 1990 | 15,905
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Cemeteries
Cemeteries of Jefferson County, Kansas, United States
Research Tips
Resources
- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
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