TIME LINE FOR SANGAMON COUNTY ILLINOIS

The location of what is now Sangamon County went through many boundary changes in almost 200 years. Researchers, for example, would want to search in St. Clair County 1790-1812, in Madison County 1812-1816, and in Madison and Bond Counties 1817-1821 Your ancestor could have came to the Northwest Territory, Indiana Territory, Illinois Territory, although settlements were sparse in that time era, mostly along the waterways, such as Mississippi River, Illinois River, etc. until the early 1800's.
This table is to be used as a guideline for your research project, to be aware of the County boundary changes.

Year	Country/Territory/County
1673	France
1763	Great Britain
1774	Quebec, Canada
1787	Illinois County, VA
27 April 1790	Northwest Territory, St. Clair County
9 February 1801	Indiana Territory, St. Clair County
28 April 1809	Illinois Territory, St. Clair County
14 September 1812	Illinois Territory, Madison County
4 January 1817	Illinois Territory, Madison and Bond County
3 December 1818	Illinois Statehood
30 January 1821	State of Illinois, Sangamon County formed. County boundaries then included the present day Counties of Scott; Morgan; Cass; Menard; Mason; Tazewell; Logan; parts of Christian; Woodford; Macon; Marshall; McLean; and Putnam.
31 January 1823	Morgan County formed/taken away from Sangamon County. Morgan included present day Counties of Scott; Cass and Morgan.
23 December 1825	Peoria County formed taking away Mason; Tazewell; and parts of McLean; Woodford; Marshall; and Putnam from Sangamon County
1839	Menard, Logan and Dane Counties (later Christian) formed from Sangamon, with parts of eastern edge of Sangamon being added to Macon County. Sangamon County is now composed as it is today.

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