1. 1808 - The first county seat of Clinton County, Missouri was established in the town of Plattsburg. 2. 1818 - The first courthouse in Clinton County was built in Plattsburg. 3. 1836 - The first post office in Clinton County was established in Plattsburg. 4. 1845 - The first school in Clinton County was established in Plattsburg. 5. 1849 - The first newspaper in Clinton County was established...
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