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Sierra Blanca is an unincorporated area in Hudspeth County, Texas, United States. It is also the county seat of the county and the namesake of a census designated place (CDP) in which it is located. The town is part of the Trans Pecos region of far West Texas, is located northeast of the Mexican border and is within the Mountain Time Zone. As of the 2020 census, its population was 315. The letters "SB" can be seen on a nearby mountain from Interstate 10.

The town was founded in 1881 at the completion point of a southern transcontinental railway. Sierra Blanca has served as the junction of the Southern Pacific and Missouri Pacific railroads. Hudspeth County was formed in 1917 from El Paso County. Sierra Blanca was named the county seat, and has the only adobe courthouse in Texas.

+Sierra Blanca racial composition (NH = Non Hispanic)RaceNumberPercentageWhite (NH)9229.21%Black or African American (NH)10.32%Native American or Alaska Native (NH)10.32%Asian (NH)72.22%Mixed/Multi Racial (NH)51.59%Hispanic or Latino20966.35%Total315
As of the 2020 United States census, there were 315 people, 114 households, and 84 families residing in the CDP.

As of the 2010 census, 553 people, 172 households, and 126 families were residing in the CDP. The population density was 116.0 people/sq mi (50.6/km2). The 227 housing units averaged 55.8/sq mi (21.5/km2). The racial makeup of the CDP was 83.91% White, 3.44% Native American, 3.25% Black, 1.45% Asian, 7.96% from other races, and 3.56% from two or more races. Latinos of any race were 72.61% of the population. Of the 172 households, 40.2% had children under 18 living with them, 45.72% were married couples living together, 13.0% had a female householder with no husband present, and 31.0% were not families. About 28.3% of all households were made up of individuals, and 11.4% had someone living alone who was 65 or older. The average household size was 2.63, and the average family size was 3.31. In the CDP, theage distribution was 29.8% under 18, 11.8% from 18 to 24, 30.8% from 25 to 44, 18.4% from 45 to 64, and 9.2% who were 65 or older. The median age was 34.3 years. For every 100 females, there were 96.0 males. For every 100 females age 18 and over, there were 101.1 males. The median income for a household in the CDP was $32,464. The per capita income for the CDP was $14,682. About 19.6% of families and 22.5% of the population were below the poverty line, including 28.3% of those under age 18 and 32.6% of those age 65 or over.

Sierra Blanca is served by the Sierra Blanca Independent School District; it spends an annual average of $6,343 per student. On average, the schools have 10.9 students per teacher. For the demographic group older than 25 years, 68.6% have a high school degree, 3.2% have a bachelor's degree, and 2.6% have a graduate degree. Hudspeth County is in the official service area of El Paso Community College.

Sierra Blanca is located on Interstate 10, 33 miles (53 km) west of Van Horn, and 87 miles (140 km) east of El Paso. Amtrak’s Sunset Limited passes through the town on Union Pacific tracks, but makes no stop. The nearest stop is located in El Paso.

The cost of living in Sierra Blanca is about 20% less than the US average. The CDP has a home ownership rate of 49.5%. The median home is valued at $54,600 with a 1.94% annual appreciation. Starting in 1992, a few miles from Sierra Blanca was the location of a sludge dump that received 250 tons of treated sewage each day by train from New York City. The practice was discontinued in 2001, after local complaints about odor and negative impact on health. In the late 1990s, the Texas Low Level Radioactive Waste Disposal Authority proposed a nuclear waste site near Sierra Blanca. The waste site was thought to bring an economic boost to the town. This proposal was eventually declined, citing concerns about the site being in the most seismically active region of Texas. Press reports indicated that in 2013, the town supported three restaurants and a motel. No grocery store is in the community.

In September 2012, singer Fiona Apple was arrested at a checkpoint for possession of small amounts of marijuana and hashish, and spent the night in jail there. A few weeks later, a Nelly tour bus was stopped at the same checkpoint, and 10 lb of marijuana were found on the bus along with heroin and a loaded gun. The singer was not arrested, but a member of his entourage was. Previously, rapper Snoop Dogg, musician Willie Nelson, and actor Armie Hammer had all been arrested separately for drug possession in Sierra Blanca. The United States Border Patrol checkpoint at Sierra Blanca sends the county thousands of drug cases a year and inspects 15,000 to 20,000 vehicles every day. The county is unable to prosecute the vast majority of these cases, as the federal government no longer funds such activities.

On July 13, 1944, three Army Air Forces crews from Biggs Army Airfield, 86 miles west of Sierra Blanca, took off on a practice mission. They proceeded to drop 10 practice bombs on Sierra Blanca. Five of the bombs disabled the main line shared by the Southern Pacific and Texas & Pacific Railroads. Another dropped on a gas station driveway, but missed the fuel tanks. No injuries or deaths were reported.