There are 16 US Post Offices in Livingston County serving a total of 36,155 residents equating to 2,260 residents per post office. It's estimated that approximately 57,707 packages are handled across the 16 county post offices annually. Livingston County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 38,950. Its county seat is Pontiac. Livingston County comprises the Pontiac, IL Micropolitan Statistical Area, which is combined with the Bloomington\u2013Normal metropolitan statistical area as the Bloomington-Pontiac, IL Combined Statistical Area."