IMLS Data Catalog:
"The Office of Research and Evaluation (ORE) supports IMLS's efforts to create strong libraries and museums that connect people to information and ideas. ORE executes three key functions: policy research, evaluations, and surveys & data. Key initiatives include the evaluation of the Grants to States program and the data collections for the Public Libraries Survey and State Library Agency Survey.
ORE's functions are detailed in Section 9108 of IMLS’ authorizing legislation, which states that we collaborate and consult with state library agencies, library and museum organizations, and other relevant agencies and organizations to conduct our research, evaluations, and data collections." --https://www.imls.gov/research-evaluation
Two key data sets for public libraries are the Library Search & compare and SLAA Survey Comparison Tool: