If yes, then I need to amend the marriage license? The Cook County Clerk's office is the official record keeper for marriages, civil unions and domestic partnerships in Chicago and suburban Cook County.Every person authorized to request a correction must complete an Affidavit and Certificate of Correction Request. Illinois Legal Aid Online provides a guided interview called an Easy Form that will help you fill out the forms. 02 ELECTRONIC FILING (eFILING) OF COURT DOCUMENTS (AMENDED JUNE 13, 2016). Now I need to get that amended through Affidavit to Amend a Marriage Record. Both parties must appear in person to fill out an application for a license to get married. If only one spouse is completing it you should select "single" otherwise, select "joint". If only one spouse is completing it you should select "single" otherwise, select "joint". Forms on this website are PDFs with fillable fields.