There are 6 US Post Offices in Limestone County serving a total of 36,362 residents equating to 6,060 residents per post office. It's estimated that approximately 58,038 packages are handled across the 6 county post offices annually. Limestone County is a county of the U.S. state of Alabama. As of the 2010 census, the county's population was 82,782. Its county seat is Athens. Its name comes from Limestone Creek, a local stream. Limestone County is included in the Huntsville, AL Metropolitan Statistical Area."