There are 4 US Post Offices in Pipestone County serving a total of 8,879 residents equating to 2,220 residents per post office. It's estimated that approximately 14,172 packages are handled across the 4 county post offices annually. Pipestone County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 9,596. Its county seat is Pipestone. The county was founded in 1857 and organized in 1879. The county was named for deposits of red pipestone used by Indians to make pipes. Pipestone National Monument is located in the county, just north of the town of Pipestone."