(10 ILCS 5/Art. 29C heading)

(10 ILCS 5/29C-5) (from Ch. 46, par. 29C-5; formerly Ch. 46, par. 811) Sec. 29C-5. Three Groups of Legislative Districts. The 59 legislative districts of this State are divided into 3 groups for the purpose of establishing the terms of Senators elected from each group. The districts in each group are distributed substantially equally over the State. The 3 groups shall consist of 20, 20 and 19 legislative districts, respectively, with each group having as its first district number, one of the numbers 1, 2 or 3, and shall be comprised of other district numbers, as follows: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 (Source: P.A. 87-1052.)

(10 ILCS 5/29C-10) (from Ch. 46, par. 29C-10) Sec. 29C-10. Terms of Senators in each group. Senators shall be elected from districts in each group of legislative districts on the dates and for terms as follows: First group - 2012 and 2016 for 4 years each, and in 2020 for 2 years; Second group - 2012 for 4 years, 2016 for 2 years, and in 2018 for 4 years; and Third group - 2012 for 2 years, and in 2014 and 2018 for 4 years each. All 59 Senators, one from each of the 59 districts, shall be elected at the first general election of representatives next occurring after each decennial redistricting. (Source: P.A. 97-6, eff. 6-3-11.)

(10 ILCS 5/29C-15) (from Ch. 46, par. 29C-15; formerly Ch. 46, par. 813) Sec. 29C-15. Determination of groups. To determine which group of Legislative Districts shall be the "First group", "Second group", or "Third group" for the purpose of establishing the terms for which Senators shall be elected in each group until the next decennial redistricting, as provided in Section 3 of Article IV of the Illinois Constitution of 1970, the Secretary of State, in the presence of the President and Minority Leader of the Senate, after due notice to them, shall, as soon as practicable after each redistricting finalized according to law, draw one card at random, from 3 cards bearing the numbers 1, 2 and 3, and then draw one card at random from the 2 remaining cards. The first number so drawn shall be the first number of the "First group" and Senators shall be elected from districts in that group for terms as provided in Section 29C-10 for that group. The second number so drawn shall be the first number of the "Second group" and Senators shall be elected from districts in that group for terms as provided in Section 29C-10 for that group. The number on the remaining card shall be the first number of the "Third group" and Senators shall be elected from districts in that group for terms as provided in Section 29C-10 for that group. (Source: P.A. 97-6, eff. 6-3-11.)