Illinois Statutes Chapter 75. Libraries § 16/5-10. Petition to establish district

(1) One hundred or more of the voters of a territory without a local tax supported library may petition the circuit court of the county that contains all of the territory (or a larger portion of the territory than any other county containing a portion of the territory) to cause to be submitted to the voters of the proposed district the question of whether the proposed territory shall be organized as a public library district. The petition shall contain the provisions set forth in this Section and, in addition, shall allege that the territory of the proposed district does not include, in whole or in part, any existing tax supported public library.

(2) The library board of a local tax supported library established by a municipality, township, or county, or 100 or more of the voters of the municipality, township, or county, may petition to cause to be submitted to the voters of the entire territory the question of whether a public library district shall be organized to include the municipality, township, or county and contiguous territory that is without a local tax supported library.