Iowa customers are served by the Omaha District Office. However, the INS maintains a field office in Des Moines, IA, for Iowa customers. The Des Moines field office is located at 210 Walnut Street, Room 369, Des Moines, IA 50302. The information counter at the office is opened on Monday, Tuesday, Thursday, and Friday from 8:00am until 2:00pm. The office is closed on Wednesday except for scheduled appointments. 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!