Sweet Grass County
There are 4 US Post Offices in Sweet Grass County serving a total of 3,559 residents equating to 890 residents per post office. It's estimated that approximately 5,681 packages are handled across the 4 county post offices annually. Sweet Grass County is a county located in the U.S. state of Montana. As of the 2010 census, the population was 3,651. Its county seat is Big Timber. The county was founded in 1895."