Under amended Supreme Court Rule 213(j) (eff. Interrogatories are written questions that one party sends to the other.The receiving party is required to answer these questions under oath. Chicago, Illinois, at or before pm on. Illinois Legal Aid Online provides a guided interview called an Easy Form that will help you fill out the forms. Do I need to file my interrogatories with the Cook County Circuit Court? Only 30 interrogatories are allowed, including subparts, unless the parties agree otherwise or the court grants leave for more. Do I need to file my interrogatories with the Cook County Circuit Court? Please be aware that forms will be displayed in a NEW browser window. Marital Interrogatories (requests the other party to answer questions) (see Illinois Supreme Court Rule 213).