There are 3 US Post Offices in Archuleta County serving a total of 11,831 residents equating to 3,944 residents per post office. It's estimated that approximately 18,884 packages are handled across the 3 county post offices annually. Archuleta County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 12,084. The county seat and the only incorporated municipality in the county is Pagosa Springs."