There are 2 US Post Offices in Presidio County serving a total of 7,641 residents equating to 3,821 residents per post office. It's estimated that approximately 12,196 packages are handled across the 2 county post offices annually. Presidio County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 7,818. Its county seat is Marfa. The county was created in 1850 and later organized in 1875. Presidio County (K-5 in Texas topological index of counties) is in the Trans-Pecos region of West Texas and is named for the ancient border settlement of Presidio del Norte. It is east from the Mexican border."