10 ILCS 5/4-16
2021 Illinois Compiled Statutes|Chapter 10 - ELECTIONS|10 ILCS 5/ - Election Code.|Article 4 - Registration Of Electors In Counties Having A Population Of Less Than 500,000

 (from Ch. 46, par. 4-16)Sec. 4-16. Any registered voter who changes his residence from one address  to another within the same county wherein this Article is in effect, may  have his registration transferred to his new address by making and signing  an application for change of residence address upon a form to be provided  by the county clerk. Such application must be made to the office of the  county clerk and may be made either in person or by mail. In case the  person is unable to sign his name, the county clerk shall require him to  execute the application in the presence of the county clerk or of his  properly authorized representative, by his mark, and if satisfied of the  identity of the person, the county clerk shall make the transfer.Upon receipt of the application, the county clerk, or one of his  employees deputized to take registrations 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 card, and if it appears that  the applicant is the same person as the person previously registered under  that name the transfer shall be made.No transfers of registration under the provisions of this Section shall  be made during the 27 days preceding any election at which such  voter would  be entitled to vote. When a removal of a registered voter takes place from  one address to another within the same precinct within a period during  which a transfer of registration cannot be made  before any election or primary, he shall be entitled to vote upon  presenting the judges of election his affidavit substantially in the form  prescribed in Section 17-10 of this Act of a change of residence address  within the precinct on a date therein specified.The county clerk may obtain information from utility companies, city,  village, incorporated town and township records, the post office, or from  other sources, regarding the removal of registered voters, and may treat  such information, and information procured from his death and marriage  records on file in his office, as an application to erase from the register  any name concerning which he may so have information that the voter is no  longer qualified to vote under the name, or from the address from which  registered, and give notice thereof in the manner provided by Section 4-12  of this Article, and notify voters who have changed their address that a  transfer of registration may be made in the manner provided in this  Section enclosing a form therefor.If any person be registered by error in a precinct other than that in  which he resides, the county clerk may transfer his registration to the  proper precinct, and if the error is or may be on the part of the  registration officials, and is disclosed too late before an election or  primary to mail the certificate required by Section 4-15, such certificate  may be personally delivered to the voter and he may vote thereon as therein  provided, but such certificates so issued shall be specially listed with  the reason for the issuance thereof.Where a revision or rearrangement of precincts is made by the county  board, the county clerk shall immediately transfer to the proper precinct  the registration of any voter affected by such revision or rearrangement of  the precinct; make the proper notations on the registration cards of a  voter affected by the revision or rearrangement and shall issue revised  certificates to each registrant of such change.Any registered voter who changes his or her name by marriage or  otherwise shall be required to register anew and authorize the cancellation  of the previous registration; but if the voter still resides in the same  precinct   the elector may, if otherwise  qualified, vote upon making an affidavit at the polling place attesting that the voter is the same person who is registered to vote under his or her former name.  The affidavit shall be treated by the election authority as authorization to cancel the registration under the former name, and the election authority shall register the person under his or her current name.The precinct election officials shall report to the county clerk the  names and addresses of all persons who have changed their addresses and  voted, which shall be treated as an application to change address  accordingly, and the names and addresses of all persons otherwise voting by  affidavit as in this Section provided, which shall be treated as an  application to erase under Section 4-12 hereof.       (Source: P.A. 94-645, eff. 8-22-05.)