There are 4 US Post Offices in Mineral County serving a total of 4,752 residents equating to 1,188 residents per post office. It's estimated that approximately 7,585 packages are handled across the 4 county post offices annually. Mineral County is a county located in the U.S. state of Nevada. As of the 2010 census, the population was 4,772, making it the fourth-least populous county in Nevada. Its county seat is Hawthorne."