There are 6 US Post Offices in Boone County serving a total of 56,166 residents equating to 9,361 residents per post office. It's estimated that approximately 89,647 packages are handled across the 6 county post offices annually. Boone County is a county located in the U.S. state of Indiana. As of 2010, the population was 56,640. The county seat is Lebanon. Indiana's center of population is located in eastern Boone County, just northwest of the town of Sheridan in neighboring Hamilton County."