There are 24 US Post Offices in Bernalillo County serving a total of 747,282 residents equating to 31,137 residents per post office. It's estimated that approximately 1,192,745 packages are handled across the 24 county post offices annually. Bernalillo County is the most populous county in the U.S. state of New Mexico. As of the 2010 census, the population was 662,564. The county seat is Albuquerque, which is the most populous city in New Mexico. Bernalillo County is the central county of the Albuquerque, NM Metropolitan Statistical Area."