There are 6 US Post Offices in Catron County serving a total of 3,528 residents equating to 588 residents per post office. It's estimated that approximately 5,631 packages are handled across the 6 county post offices annually. Catron County is a county located in the U.S. state of New Mexico. As of the 2010 census, the population was 3,725, making it the third-least populous county in New Mexico. Its county seat is Reserve. Catron County is the largest county by area in New Mexico."