There are 5 US Post Offices in Lake County serving a total of 10,537 residents equating to 2,107 residents per post office. It's estimated that approximately 16,818 packages are handled across the 5 county post offices annually. Lake County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 10,866. Its county seat is Two Harbors."