Public Library of Cincinnati and Hamilton County

The Public Library of Cincinnati and Hamilton County (PLCH) is a public library system in the United States. In addition to its main library location in downtown Cincinnati, Ohio, PLCH operates 41 regional and branch locations throughout Hamilton County.

As of 2012, the PLCH's collection holds about nine million volumes, making it the 13th-largest library in the U.S.[5] In 2008, PLCH had an annual circulation of over fifteen million items.[2] The downtown location alone circulates over four million items annually, the most of any single library location in the country, and has an area of 542,527 square feet (50,402.4 m2).

More information on the Wikipedia page