Mercer County Extension Office - Branch office of Ohio State University, it combines the needs of local citizens and communities, with new research and technical information. The Political Graveyard: Mercer County, Ohio - Site contains information on the political history of Mercer County, cemeteries and memorial sites in the county. Mercer County - Site provides information on all county offices and departments. Celina - Mercer Chamber of Commerce - Presents calendar of events, officer and trustee directory, education, and business information. Mercer County - Board of Elections - Posts live and previous election results. Also provides the election calendar and information about the board, issues, candidates, and absentee ballot application. Mercer County Fair - Includes schedule and information about the fair and other events held on the fairgrounds in Celina. Mercer County District Library - Located in Celina with branches located in Mendon, Chickasaw, and St. Henry. Provides an online database, branch details, hours, special holdings, and programs offered. Mercer County Community Development - Attracts and retains businesses with the help of many good state and local programs. Also presents an overview of the county. County Map - Map of Mercer County. Mercer County Educational Service Center - Provide services which assist in providing a quality education for Pre-K to 12th grade students. Mercer County Sheriff's Office - Provides profile of department, personnel, and history. Profile for Mercer County - Information on the political infrastructure of the county.