There are 8 US Post Offices in Jasper County serving a total of 9,935 residents equating to 1,242 residents per post office. It's estimated that approximately 15,857 packages are handled across the 8 county post offices annually. Jasper County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 9,698. Its county seat is Newton."