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Jefferson County
Contact InformationJefferson County Courthouse
100 S. 10th St.
Mt. Vernon, IL 62864
618-244-8020 – County Clerk
618-244-8007 – Circuit Clerk
618-244-8020 – Recorder
IRAD—c/o Records Management
Morris Library, Mail Code 6808
Southern Illinois University
1835 University Press Dr.
Carbondale, IL 62901-6808
618-453-3040
Established
- March 26, 1819 (Laws, 1819, p. 51)
Origin of the name of the county
- Named after Thomas Jefferson, third President of the United States (1801–1809) and author of the Declaration of Independence.
Present area, or parts of it, formerly included in
- 1815–1819 – Edwards
- 1815–1819 – White
- 1812–1815 – Gallatin
- 1795–1813 – Randolph
- 1790–1803 – St. Clair
- 1790–1801 – Knox, Northwest Territory
County Seats
- 1819–present – Mount Vernon
History of county governing board
- 1819–1849 – County Commissioners’ Court
- 1849–1870 – County Court
- 1870–present – County Board of Supervisors
Township Government
- Adopted – November 2, 1869
Township Names
- Bald Hill
- Blissville
- Casner
- Dodds – Formed from Pendleton (date unknown, after 1921).
- Elk Prairie – Name changed from Anderson on April 29, 1870.
- Farrington
- Field
- Grand Prairie
- McClellan – Name changed from Allen on April 29, 1870.
- Moore’s Prairie
- Mt. Vernon
- Pendleton
- Rome
- Shiloh
- Spring Garden
- Webber
Township Map
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