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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
Jefferson County is a county located in the U.S. state of Iowa. The population was 16,843 in the 2010 census, an increase from 16,181 in the 2000 census.[1][2] The county seat is Fairfield.
Timeline
| Date | Event | Source
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| 1838 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1838 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1839 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1839 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1840 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1840 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1840 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1880 | 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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| 1840 | 2,773
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| 1850 | 9,904
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| 1860 | 15,038
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| 1870 | 17,839
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| 1880 | 17,469
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| 1890 | 15,184
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| 1900 | 17,437
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| 1910 | 15,951
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| 1920 | 16,440
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| 1930 | 16,241
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| 1940 | 15,762
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| 1950 | 15,696
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| 1960 | 15,818
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| 1970 | 15,774
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| 1980 | 16,316
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| 1990 | 16,310
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Research Tips
External links
www.rootsweb.com/~iajeffer/
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