Sangamon County, Illinois 

 

Summary

Area settled, 1817.1 Established as Sangamo Co., 30 Jan. 1821; name changed to Sangamon Co., 5 June 1821.2 Population in 1840 about 15,000.3 Population in 1850 about 19,000.4 County seat, Springfield; site of JS’s habeas corpus hearing in federal circuit court, Jan. 1843.5

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