Jefferson County

US States / H-L / Illinois / Jefferson County

Jefferson County is named for Thomas Jefferson, who was President of the United States from 1801 to 1809, an American revolutionary leader and author of the Declaration of Independence.


Created:  March 26, 1819

County Seat:

Mount   Vernon 1819 – present


County Courthouse – Mount Vernon


Location:  100 10th Street / Main Street

Built:  1939 – 1941

Style:  Art Deco

Architect:  William R McCoy of McCoy and Wilson

Contractor:  J M Stover and other local trades


Description: The building faces south and is a three story gray colored stone structure. The south front has three vertical sections dived by stone pillars and with doorway in the center and a large window on the east and west section on the first story, and large windows in each panel on the second story. Above the doorway is a clock. The third story is recessed. The building has square lines with sections protruding from the main building. The building was constructed under the Works Progress Administration.



See:  Illinois Appellate Court – Mount Vernonis located in the county.



N – Marion County

E – Wayne County and Hamilton County 

S – Franklin County

W – Perry County and Washington County











Photos taken 2007 and 2012