The Institute of Museum and Library Services (IMLS) maintains a database of the Public Library Surveys (PLS) a.k.a Annual Reports, which allow users to search and compare statistics for public libraries across the United States.
Using the link below, you can review the data elements that are searchable.
This tool will also allow you to view specific data points in graphic form. You can also elect to view the totals for data or per person in the legal service area (LSA). Do this by selecting the library and once on the page, click the view and download library statistics icon toward the top and it will give you a visual representation.