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Illinois State Employee Retirement System Springfield Office: 2101 S. Veterans Parkway Springfield, Illinois 62704-9255 Mailing Address: P.O. Box 19255 Springfield, Illinois 62794 Phone: 217-785-7444 Fax: 217-785-7019 Chicago Office: Michael A. Bilandic Building 160 N LaSalle Street, Suite S200 Chicago, Illinois 60601 Phone: 217-785-7444 Fax: 312-814-5805 Service Hours: 8:00 - 4:30, Monday - Friday (except Holidays) Website: https://www2.illinois.gov/sites/SRS/SERS/Pages/default.aspx