There are 5 US Post Offices in Iron County serving a total of 5,515 residents equating to 1,103 residents per post office. It's estimated that approximately 8,803 packages are handled across the 5 county post offices annually. Iron County is a county located in the U.S. state of Wisconsin. As of the 2010 census, the population was 5,916, making it the third-least populous county in Wisconsin. Its county seat is Hurley. It was named for the valuable iron ore found within its borders."