There are 11 US Post Offices in Pine County serving a total of 30,832 residents equating to 2,803 residents per post office. It's estimated that approximately 49,211 packages are handled across the 11 county post offices annually. Pine County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 29,750. Its county seat is Pine City. The county was formed in 1856 and organized in 1872. A portion of the Mille Lacs Indian Reservation is in the county."