There are 21 US Post Offices in Navajo County serving a total of 101,883 residents equating to 4,852 residents per post office. It's estimated that approximately 162,617 packages are handled across the 21 county post offices annually. Navajo County is located in the northern part of the U.S. state of Arizona. As of the 2010 census, its population was 107,449. The county seat is Holbrook. Navajo County comprises the Show Low, AZ Micropolitan Statistical Area. Navajo County contains parts of the Hopi Indian reservation, the Navajo Nation and Fort Apache Indian Reservation."