There are 7 US Post Offices in Swift County serving a total of 10,133 residents equating to 1,448 residents per post office. It's estimated that approximately 16,173 packages are handled across the 7 county post offices annually. Swift County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 9,783. Its county seat is Benson."