There are 7 US Post Offices in Hernando County serving a total of 107,388 residents equating to 15,341 residents per post office. It's estimated that approximately 171,403 packages are handled across the 7 county post offices annually. Hernando County is a county located in the U.S. state of Florida. As of the 2010 census, the population was 172,778. Its county seat is Brooksville, and its largest community is Spring Hill. Hernando County is included in the Tampa-St. Petersburg-Clearwater, FL Metropolitan Statistical Area. As of 2005, Hernando was the 35th fastest-growing county in the country."