The 21st Illinois General Assembly, consisting of the Illinois Senate and the Illinois House of Representatives, met from January 3, 1859, to February 24, 1859.
The 21st General Assembly was preceded by the 20th Illinois General Assembly, and was succeeded by the 22nd Illinois General Assembly.
Senate
DistrictJurisdiction(s) representedImageSenatorRemarks1Cook County2Lake County3Ogle County4Stephenson County5Lee County6Will County7LaSalle County8Peoria County9 Stark County 10 Fulton County11Schuyler County12Adams County13 Pike County14Jersey County15Sangamon County16Macon County17 Tazewell County18Coles County19Jasper County20Marion County21Madison County22St. Clair County23White County24Washington County25Johnson County
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