Public Library of Youngstown and Mahoning County - Serves the informational, educational and recreational needs of Mahoning and surrounding counties. Mahoning County, Ohio - U.S. Census Bureau - Provides population, demographic, and housing information. Mahoning County - Official site provides information about government officials, courts, departments, and meetings. Mahoning County Sheriff's Office - Official site of the department provides overview, list of stations and public information. County Map - Map of Mahoning County. Profile for Mahoning County - Information on the political infrastructure of the county.