Candidates who seek office in a district may obtain signatures only from registered voters in the district. In order to determine the district(s) for an address, please enter the address in the district locator. Maps and legal descriptions are available for congressional and representative districts.

The Cook County Judicial Circuit as well as the Twelfth, Sixteenth, Seventeenth, Nineteenth, and Twenty-Second circuits have been divided into subcircuits (downstate and collar county subcircuits) for the purpose of electing subcircuit judges. Maps and legal descriptions are available for all subcircuits.