There are 6 US Post Offices in Jackson County serving a total of 9,850 residents equating to 1,642 residents per post office. It's estimated that approximately 15,722 packages are handled across the 6 county post offices annually. Jackson County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 10,266. Its county seat is Jackson. The county was named for Henry Jackson, the first merchant in St. Paul."