There are 8 US Post Offices in Winona County serving a total of 50,270 residents equating to 6,284 residents per post office. It's estimated that approximately 80,237 packages are handled across the 8 county post offices annually. Winona County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 51,461. Its county seat is Winona. Winona County comprises the Winona, MN Micropolitan Statistical Area."