There are 8 US Post Offices in Sandusky County serving a total of 53,513 residents equating to 6,689 residents per post office. It's estimated that approximately 85,413 packages are handled across the 8 county post offices annually. Sandusky County is a county in the U.S. state of Ohio. As of the 2010 census, the population was 60,944. Its county seat is Fremont. The county was formed on February 12, 1820 from portions of Huron County. It is named for a native word meaning \"water\" (Wyandot: saundustee). The Fremont, OH Micropolitan Statistical Area includes all of Sandusky County."