Rio Arriba County
There are 23 US Post Offices in Rio Arriba County serving a total of 55,911 residents equating to 2,431 residents per post office. It's estimated that approximately 89,240 packages are handled across the 23 county post offices annually. Rio Arriba County is a county located in the U.S. state of New Mexico. As of the 2010 census, the population was 40,246. Its county seat is Tierra Amarilla. Its northern border is the Colorado state line. Rio Arriba County comprises the Espa\u00f1ola, NM Micropolitan Statistical Area, which is also included in the Albuquerque-Santa Fe-Las Vegas, NM Combined Statistical Area."