Illinois is served by the Chicago District Office. The office is located at 10 West Jackson Boulevard; Chicago, IL 60604. The telephone number is 312.385.1500. The office is open from 7:30am until 2:00pm Monday through Thursday. The office is open on Friday for obtaining forms and for those with an appointment. The address to the Chicago Adjudications Office is 230 S. Dearborn, 23d Floor, Chicago, IL 60604. The address to the Chicago Citizenship Office is 539 S. LaSalle, Chicago, IL 60605. Click here to find the INS USCIS Immigration Forms you need! Click Here for Immigration Information, Reports, and Frequent Questions Click here to find the immigration books and manuals you need!