There are 7 US Post Offices in Lawrence County serving a total of 43,671 residents equating to 6,239 residents per post office. It's estimated that approximately 69,704 packages are handled across the 7 county post offices annually. Lawrence County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 41,869. Its county seat and largest city is Lawrenceburg. Lawrence County comprises the Lawrenceburg, TN Micropolitan Statistical Area, which is also included in the Nashville-Davidson-Murfreesboro, TN Combined Statistical Area."