Presidio County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 6,131. Its county seat is Marfa. The county was created in 1850 and later organized in 1875. Presidio County is in the Trans-Pecos region of West Texas and is named for the border settlement of Presidio del Norte. It is on the Rio Grande, which forms the Mexican border.

Marfa is a city in the high desert of the Trans-Pecos in far West Texas, United States, between the Davis Mountains and Big Bend National Park, at an elevation of 4685 feet. It is the county seat of Presidio County, and its population as of the 2020 United States Census was 1,788. The city was founded in the early 1880s as a water stop; the population peaked in the 1930s and has continued to decline each decade since. However, today Marfa is a tourist destination and a major center for minimalist art. Attractions include Building 98, the Chinati Foundation, artisan shops, historical architecture, a classic Texas town square, modern art installments, art galleries, and the Marfa lights.