There are 2 US Post Offices in Trousdale County serving a total of 7,799 residents equating to 3,900 residents per post office. It's estimated that approximately 12,448 packages are handled across the 2 county post offices annually. Trousdale County, also known as Hartsville/Trousdale County, is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 7,870. Its county seat is Hartsville, with which it shares a consolidated city-county government. With an area of just 117 square miles (300 km2), it is Tennessee's smallest county. Trousdale County is part of the Nashville-Davidson\u2013Murfreesboro\u2013Franklin, TN Metropolitan Statistical Area, although it is located just beyond the ring of \"bedroom communities\" in the Nashville metropolitan area. Farming and livestock-raising characterize this largely rural area. Hartsville is the county seat of Trousdale County and now coextensive with it as a metropolitan government by virtue of a referendum which passed in Trousdale County by a single vote. Trousdale County High School is located here, as well as a technical school operated by the Tennessee Board of Regents. Trousdale County is one of two counties in Tennessee to have legalized parimutuel betting on horse racing, but no group has ever stepped forward to build a racetrack."