The current list of Illinois State Senators is available on the Illinois General Assembly website. The Illinois Senate is made up of 59 senators elected from individual legislative districts determined by population.
To serve as a member of the General Assembly, a person must be a U.S. citizen, at least 21 years of age, and a resident of the district that he represents for the two years preceding the election. The Illinois Constitution of 1970 requires staggered elections for senators, meaning that not all senators are elected simultaneously. Every Senate district elects its members to serve two four-year terms and one two-year term in each decade. Senators are divided into three groups for purposes of elections: one third of the Senate is elected for one 2-year term, followed by two 4-year terms; one third of the Senate is elected for one 4-year term, followed by one 2-year term, and then one 4-year term; and one third of the Senate is elected for two 4-year terms, followed by one 2-year term.