1. a) An address on file with the Department;
2. b) An address on file with the Secretary of State;
3. c) An address on file with any other State agency with which the respondent shall maintain a current address; or
4. d) Any other address, including e-mail address, the Department reasonably calculates to be a true and current address for the party.

Service of any document upon any person may be made by personal delivery, certified mail with the return receipt signed by the person or its agent, US regular mail with postage prepaid, electronic mail (e-mail) when agreed to by the party, or any other verifiable means, such as private carrier, to the following:

(Source: Added at 50 Ill. Reg. 7177, effective April 28, 2026)