10 ILCS 5/6-53
Any registered elector who changes his residence from one address number or place to another within the same precinct, city or village or incorporated town, may have his registration transferred to his new address by making and signing an application for such change of residence address upon a form to be provided by such board of election commissioners. Such application may be made to the office of such board or at any place designated in accordance with section 6--51 of this Article.
Upon receipt of such application the board of election commissioners or officer, employee or deputy registrar designated by such board shall cause the signature of the voter and the data appearing upon the application to be compared with the signature and data on the registration record, and if it appears that the applicant is the same person as the party previously registered under that name, the transfer shall be made. In case the person is unable to sign his name the board of election commissioners shall require such person to execute the request in the presence of the board or of its properly authorized representative, by his mark, and if satisfied of the identity of the person, the board of election commissioners shall make the transfer. The person in charge of the registration shall draw a line through the last address, ward and precinct number on the original and duplicate and write the new address, ward and precinct number on the original and duplicate registration records.
Any registered elector may transfer his registration only at any such time as is provided by this Article for the registration of voters at the office of the board. When a removal of a registered voter takes place from one address to another within the same precinct within a period during which such transfer of registration cannot be made, before any election or primary, he shall be entitled to vote upon presenting to the judges of election an affidavit of a change and having said affidavit supported by the affidavit of a qualified voter who is a householder in the same precinct. Suitable forms for this purpose shall be provided by the board of election commissioners whose duty it is to conduct the election; and thereupon the precinct election officials shall report to the board of election commissioners the names of all such persons who have changed their address and voted.
The board of election commissioners may obtain information from utility companies, city records, the post office or from other sources regarding the removal of registered voters, and notify such voters that a transfer of registration may be made in the manner provided by this section.
If any person be registered by error in a precinct other than that in which he resides, a transfer of registration to the precinct in which he resides may be made in the manner provided by this section.
Where a revision or rearrangement of precincts is made by the board of election commissioners under the power conferred by Section 11--3 of Article 11 of this Act, such board shall immediately transfer to the proper precinct the registration of any voter affected by such revision or rearrangement of precincts; make the proper notations on the cards in the master and precinct files; and shall notify the registrant of such change.
10 ILCS 5/6-53