13th Illinois General Assembly

The 13th Illinois General Assembly, consisting of the Illinois Senate and the Illinois House of Representatives, met from December 5, 1842, to March 6, 1843 (1st session).

The 13th General Assembly was preceded by the 12th Illinois General Assembly, and was succeeded by the 14th Illinois General Assembly.

On January 14, 1841, during the 12th Illinois General Assembly, the ratio of population per Senate seat was fixed at 12,000, and for Representatives at 4,000 resulting in a Senate of forty-one members and a House of one hundred twenty-one members. This arrangement lasted until February 25, 1847, when a new apportionment was made.