There are 16 US Post Offices in Lebanon County serving a total of 105,921 residents equating to 6,620 residents per post office. It's estimated that approximately 169,062 packages are handled across the 16 county post offices annually. Lebanon County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 133,568. Its county seat is Lebanon. The county was formed from portions of Dauphin and Lancaster counties in 1813, with minor boundary revisions in 1814 and 1821. Lebanon County comprises the Lebanon, PA Metropolitan Statistical Area, which is also included in the Harrisburg-York-Lebanon, PA Combined Statistical Area.