Ill. Admin. Code tit. 2, § 1201.300
b) The Agency has one FOI Officer, located in the Springfield office.
d) FOIA requests may be submitted via mail, e-mail, fax, or hand delivery. Requests should be mailed or hand delivered to:
Illinois Department of Revenue
101 West Jefferson Street, MC 6-595
Springfield IL 62702
Attn: FOI Officer