There are 7 US Post Offices in Bond County serving a total of 17,661 residents equating to 2,523 residents per post office. It's estimated that approximately 28,189 packages are handled across the 7 county post offices annually. Bond County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 17,768. Its county seat is Greenville. Bond County is included in the St. Louis, MO-IL Metropolitan Statistical Area."