There are 10 US Post Offices in Carbon County serving a total of 15,805 residents equating to 1,581 residents per post office. It's estimated that approximately 25,227 packages are handled across the 10 county post offices annually. Carbon County is a county located in the U.S. state of Wyoming. As of the 2010 census, the population was 15,885. Its county seat is Rawlins. It is north from the Colorado state line."