820 ILCS 405/2203
Whenever service of notice is required by Sections 2200 or 2201, such notice shall be deemed to have been served when deposited with the United States certified or registered mail addressed to the employing unit at its principal place of business, or its last known place of business or residence, or may be served by any person of full age in the same manner as is provided by statute for service of process in civil cases. If represented by counsel in the proceedings before the Director, then service of notice may be made upon such employing unit by mailing same to such counsel. If agreed to by the person or entity entitled to notice, notice may be given and completed electronically, in the manner prescribed by rule, by posting the notice on a secure web site accessible to the person or entity and sending notice of the posting to the last known e-mail address of the person or entity. All hearings provided for in Sections 2200 and 2201 shall be held in the county wherein the employing unit has its principal place of business in this State, provided that if the employing unit has no principal place of business in this State, such hearing may be held in Cook County, provided, further, that such hearing may be held in any county designated by the Director if the petitioning employing unit shall consent thereto. The hearings shall be conducted by the Director or by any full-time employee of the Director, selected in accordance with the provisions of the "Personnel Code" enacted by the Sixty-Ninth General Assembly, by him designated. Such representative so designated by the Director shall have all powers given the Director by Sections 1000, 1002, and 1003 of this Act.
820 ILCS 405/2203