Ill. Admin. Code tit. 83, § 737.500
Each Local Provider shall have on file with the Commission an exchange area boundary map for each of its exchanges within the State of Illinois. Competitive Non-Electing Providers may satisfy the requirements of all Sections of this Subpart by filing information with the Commission, upon request, identifying the exchanges in which they offer telecommunications services.
(Source: Amended at 39 Ill. Reg. 364, effective December 22, 2014)