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- the text in this section is copied from an article in Wikipedia
Jefferson County is located in the eastern portion of the state of Missouri. It is a part of the St. Louis Metropolitan Area. As of the 2020 census, the population was 226,739, making it the sixth-most populous county in Missouri. Its county seat is Hillsboro. The county was organized in 1818 and named in honor of former president Thomas Jefferson.
In 1980, according to the U.S. census held that year, the county contained the mean center of U.S. population. Notably, this was the first census in which the center of population was west of the Mississippi River.
Jefferson County is part of the St. Louis Metropolitan Statistical Area and encompasses many of the city's southern suburbs.
Timeline
| Date | Event | Source
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| 1818 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1819 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1819 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1820 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1820 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1825 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1830 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1883 | 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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| 1820 | 1,835
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| 1830 | 2,592
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| 1840 | 4,296
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| 1850 | 6,928
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| 1860 | 10,344
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| 1870 | 15,380
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| 1880 | 18,736
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| 1890 | 22,484
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| 1900 | 25,712
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| 1910 | 27,878
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| 1920 | 26,555
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| 1930 | 27,563
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| 1940 | 32,023
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| 1950 | 38,007
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| 1960 | 66,377
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| 1970 | 105,248
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| 1980 | 146,183
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| 1990 | 171,380
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Cemeteries
Cemeteries of Jefferson County, Missouri, United States
Research Tips
Resources
- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
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