There are 8 US Post Offices in Grand County serving a total of 14,818 residents equating to 1,852 residents per post office. It's estimated that approximately 23,651 packages are handled across the 8 county post offices annually. Grand County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 14,843. The county seat is Hot Sulphur Springs."