30 ILCS 740/3-1.02
"Participant" means any county located outside the boundaries of the Regional Transportation Authority as established under the Regional Transportation Authority Act and outside the Bi-State Metropolitan Development District established under an Act approved July 26, 1949, except that beginning, July 1, 1987 the counties within the boundaries of the Bi-State Metropolitan Development District may be eligible for capital assistance only, or within such county any municipality with 20,000 or more population that is not included in an urbanized area or the boundaries of a local mass transit district; or within such county any municipality with 20,000 or less population receiving State mass transportation operating assistance under the Downstate Public Transportation Act during Fiscal Year 1979; or within such county or counties a local mass transit district organized under the local Mass Transit District Act which is not included in an urbanized area or the boundaries of a local mass transit district which includes an urbanized area; provided, however, that no such entity shall be eligible to participate unless it agrees to adhere to the regulations and requirements of the Secretary of Transportation of the federal Department of Transportation affecting Section 18 assistance or any other conditions as deemed reasonable and necessary by the Illinois Department of Transportation.
30 ILCS 740/3-1.02