10 ILCS 5/4-14
In all registrations it shall be the duty of every board of registry conducting a registration under Section 4-7 of this Article, at the time of making delivery of its registration records to the county clerk, to make a report to the clerk listing the names of all registered persons in such precinct for which it has served as a board of registry whom it knows or upon information believes to have removed from the precinct in which such person is registered. Where no further registration is had under the provisions of Section 4--7 prior to an election, it shall be the duty of the judges of election of each precinct, on or before Tuesday three weeks preceding the election, to make a report to the county clerk listing the names of all registered persons in such precinct whom they know or on information believe to have removed from the precinct in which such person is registered. Such report by the board of registry or the judges of election shall be treated as an application to erase from the register any name appearing in such report, and notice thereof shall be given to such person in the manner provided by Section 4--12 of this Article. If such person does not appear at the time and place designated in the notice, his registration shall be cancelled by the county clerk.
10 ILCS 5/4-14