There are 1 US Post Offices in Grand County serving a total of 9,772 residents equating to 9,772 residents per post office. It's estimated that approximately 15,597 packages are handled across the 1 county post offices annually. Grand County is a county located in the U.S. state of Utah. As of the 2010 census, the population was 9,225. Its county seat and largest city is Moab. The county was named for the Colorado River, which at the time of statehood was known as the Grand River. It is west from the Colorado state line."