This report marks the fifth release of library statistics data from the Institute of Museum and Library Services (IMLS). It contains data on state library agencies in the 50 states and the District of Columbia for Fiscal Year (FY) 2010. The data were collected through the State Library Agencies (StLA) Survey, the product of a cooperative effort between the Chief Officers of State Library Agencies (COSLA), IMLS, and the U.S. Census Bureau.