There are 9 US Post Offices in Clallam County serving a total of 53,101 residents equating to 5,900 residents per post office. It's estimated that approximately 84,755 packages are handled across the 9 county post offices annually. Clallam County is a county in the U.S. state of Washington. As of the 2010 census, the population was 71,404. The county seat and largest city is Port Angeles. The name is a Klallam word for \"the strong people\". The county was formed on April 26, 1854. Located on the Olympic Peninsula, it is south from the Strait of Juan de Fuca, which forms the Canada\u2013US border, as British Columbia's Vancouver Island is across the strait. Clallam County comprises the Port Angeles, WA Micropolitan Statistical Area."