Research by the Institute of Museum and Library Services (IMLS) found shifts in Americans’ interaction with public libraries’ materials, programs and services in Fiscal Year 2013. The survey report describes findings from public libraries in the 50 states, the District of Columbia, and Puerto Rico. With the available survey data, the report provides aggregated local, state and national information about the nation’s 9,000 public libraries and their 16,500 branches and bookmobiles.
https://www.imls.gov/sites/default/files/publications/documents/plsfy2013.pdf