75 ILCS 16/1-10

To provide local public institutions of general education for citizens of Illinois, library districts and libraries may be established, equipped, and maintained by the board pursuant to this Act. That library shall be forever for the use of the residents and taxpayers of the district in which it is located, subject to reasonable rules and regulations the board adopts to render the use of the library of the greatest benefit to the greatest number of those residents and taxpayers.