Redistricting (drawing district maps) in Illinois is done by the state legislature after each census. They use official U.S. Census population data and GIS mapping software (like Maptitude or ArcGIS) to create boundaries.
No AI is involved—it's human mapmakers applying legal rules: equal population, contiguity, compactness, and Voting Rights Act compliance for minority representation. Previous maps often serve as the starting "template," adjusted for new data and politics.
This current proposal would amend the state constitution to tweak those priorities.