Highland County Extension Office - Branch office of Ohio State University, it combines the needs of local citizens and communities, with new research and technical information. Highland County, Ohio - Information provided by the Convention and Visitors Bureau includes history, businesses, education and government. Highland County Sheriff's Office - Provides profile of department, history, law enforcement programs, crime statistics and list of registered sex offenders. Highland County, Ohio -- U.S. Census Bureau - Provides population, demographic, and housing information. County Map - Ohio Department of Transportation map of Highland County. Profile for Highland County - Information on the political infrastructure of the county.