10 ILCS 5/5-23
2021 Illinois Compiled Statutes|Chapter 10 - ELECTIONS|10 ILCS 5/ - Election Code.|Article 5 - Registration Of Electors In Counties Having A Population Of 500,000 Or More

 (from Ch. 46, par. 5-23)Sec. 5-23. Any registered voter who changes his residence from one address,  number or place to another within the same county wherein this Article 5  is in effect, may have his registration transferred to his new address by  making and signing an application for such change of residence upon a form  to be provided by the county clerk. Such application must be made to the  office of the county clerk. In case the person is unable to sign his name  the county clerk shall require such person to execute the request 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 such 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, and if it appears that the applicant  is the same person as the party previously registered under that name the  transfer shall be made.Transfer of registration under the provisions of this section may not be  made within the period when the county clerk's office is closed to registration  prior to an election at which such voter would be entitled to vote.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; provided, however, that if  the change of name takes place within a period during which such new  registration cannot be made, next preceding any election or primary, the  elector may, if otherwise qualified, vote upon making the following  affidavit before the judges of election:I do solemnly swear that I am the same person now registered in the  .... precinct of the .... ward of the city of .... or .... District Town  of .... under the name of .... and that I still reside in said precinct  or district.       (Signed) ....If the voter whose name has changed still resides in the same precinct, the voter may vote after making the affidavit at the polling place regardless of when the change of name occurred. In that event, the affidavit shall not state that the voter is required to register; 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 voter under his or her current name.Suitable forms for this purpose shall be provided by the county clerk. The form  in all cases shall be similar to the form furnished by the county clerk  for county and state elections.The precinct election officials shall report to the county clerk the names  and addresses of all such persons who have changed their addresses and voted.  The city, village, town and incorporated town clerks shall within five days  after every election report to the county clerk the names and addresses  of the persons reported to them as having voted by affidavit as in this  Section provided.The county clerk may obtain information from utility companies, city,  village, town and incorporated town 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 the county clerk shall be empowered to transfer his  registration to the proper precinct.Where a revision or rearrangement of precincts is made by the board  of county commissioners, the county clerk shall immediately transfer to  the proper precinct the registration of any voter affected by such  revision or rearrangement of the precincts; make the proper notations on  the registration cards of a voter affected by the revision of  registration and shall notify the registrant of such change.       (Source: P.A. 94-645, eff. 8-22-05.)