1. 1808 - The first permanent settlement in Jefferson County was established by Moses Austin. 2. 1818 - The Missouri General Assembly created Jefferson County from St. Louis County. 3. 1821 - The first courthouse in Jefferson County was built in Herculaneum. 4. 1832 - The first public school in Jefferson County was established in Hillsboro. 5. 1855 - The first railroad in Jefferson County was c...
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