There are 2 US Post Offices in Florence County serving a total of 3,227 residents equating to 1,614 residents per post office. It's estimated that approximately 5,151 packages are handled across the 2 county post offices annually. Florence County is a county located in the U.S. state of Wisconsin. As of the 2010 census, the population was 4,423, making it the second-least populous county in Wisconsin. Its county seat is Florence. Florence County is part of the Iron Mountain, MI\u2013WI Micropolitan Statistical Area."