The Chicago Public Library consists of 79 branches throughout the city of Chicago, Illinois, USA.
In the aftermath of the 1871 Great Chicago Fire, Londoner A.H. Burgess, with the aid of Thomas Hughes drew up what would be called the "English Book Donation," which proposed that England should provide a free library to the burnt-out city. After circulating requests for donations throughout English society, the project donated 8,000 books. Private donors included Queen Victoria, Benjamin Disraeli, Alfred Lord Tennyson, Robert Browning, John Stuart Mill, John Ruskin, and Matthew Arnold.
In Chicago, city leaders petitioned Mayor Joseph Medill to hold a meeting and establish the library. The meeting led to the Illinois Library Act of 1872, which allowed Illinois cities to establish tax-supported libraries. In April 1872, the Chicago City Council passed an ordinance establishing the Chicago Public Library, and on January 1, 1873, the Chicago Public Library officially opened its doors in an abandoned iron water tank at LaSalle and Adams Streets. The collection included 3,157 volumes. The water tank was 58 feet in diameter, 21 feet high and with a 30 foot foundation. A two story office building was soon built around it to hold city offices, and a third floor reading room was built for the library.