10 ILCS 5/8-10
Except as otherwise provided in this Code, not less than 68 days prior to the date of the primary, the State Board of Elections shall certify to the county clerk for each county, the names of all candidates for legislative offices, as specified in the petitions for nominations on file in its office, which are to be voted for in such county, stating in such certificates the political affiliation of each candidate for nomination, as specified in the petitions. The State Board of Elections shall, in its certificate to the county clerk, certify to the county clerk the names of the candidates in the order in which the names shall appear upon the primary ballot, the names to appear in the order in which petitions have been filed.
Not less than 62 days prior to the date of the primary, the county clerk shall certify to the board of election commissioners if there be any such board in his county, the names of all candidates so certified to him by the State Board of Elections in the districts wholly or partly within the jurisdiction of said board and in the order in which such names are certified to him.
10 ILCS 5/8-10