The Mississippi Library Commission, which acquires and publishes usage data from each of the 46 public library systems and two independent public libraries in the state, reports the data presented in this publication to the Federal State Cooperative System (FSCS) for Public Library Data. First, a 2-year summary (1997-1998) for public library systems is tabulated, followed by a list of Mississippi public library systems with city and population group, and definitions used by the FSCS for Public Library Data. Statistics are then reported for 1998 on library operations, income, expenditures, circulation, and other services. Branch hours and circulation figures are listed. At the end of the publication, public library systems and branches are listed alphabetically, including librarian/director names, address, county, hours, telephone number, and e-mail address (when available). (AEF)