There are 7 US Post Offices in Sargent County serving a total of 3,795 residents equating to 542 residents per post office. It's estimated that approximately 6,057 packages are handled across the 7 county post offices annually. Sargent County is a county located in the U.S. state of North Dakota. As of the 2010 census, the population was 3,829. Its county seat is Forman. The county was formed in 1883."