South Texas
South Texas encompasses a vast and culturally distinctive region extending from the San Antonio metropolitan area southward through the Brush Country and Winter Garden region to the Rio Grande Valley along the Mexican border. This region, shaped by more than three centuries of Spanish, Mexican, and Texan heritage, is defined by its deep Hispanic cultural roots, extensive military presence, international trade infrastructure, agricultural production, and the dynamic border economy that has made it one of the most important corridors for U.S.-Mexico commerce. With a combined population exceeding 6 million residents across San Antonio, the border cities, and the numerous communities between them, South Texas represents a significant and growing share of the state's demographic and economic future.
San Antonio
San Antonio, situated in Bexar County at the southern edge of the Edwards Plateau where the Hill Country meets the South Texas plains, is the second largest city in Texas by population (approximately 1.5 million within city limits) and the seventh largest in the United States. The San Antonio-New Braunfels metropolitan area encompasses approximately 2.6 million residents and generates an annual gross metropolitan product exceeding $130 billion. The city's economy is built on four primary pillars: military and defense, tourism, healthcare, and a growing technology sector with particular strength in cybersecurity.
Joint Base San Antonio (JBSA) is the largest joint base installation in the Department of Defense, encompassing three formerly separate installations -- Fort Sam Houston, Lackland Air Force Base, and Randolph Air Force Base -- along with Camp Bullis and numerous support facilities. JBSA is the single largest employer in San Antonio, with more than 80,000 military personnel, civilian employees, and contractors. Lackland Air Force Base is the sole location for U.S. Air Force Basic Military Training, processing every Air Force recruit in the country. Fort Sam Houston houses the Brooke Army Medical Center (the military's only Level I trauma center), the Army Medical Center of Excellence, and numerous other military medical training programs. Randolph Air Force Base serves as the headquarters for Air Education and Training Command.
Tourism is the second largest economic driver in San Antonio, anchored by the Alamo -- the most visited tourist attraction in Texas and one of the most recognized historic sites in the United States -- and the River Walk, a network of walkways along the San Antonio River below street level that connects restaurants, hotels, shops, and cultural venues throughout the downtown core. The River Walk extends approximately 15 miles and generates billions of dollars in economic activity annually. Other major attractions include the San Antonio Missions National Historical Park, a UNESCO World Heritage Site encompassing four 18th-century Spanish colonial missions, and the SeaWorld and Six Flags Fiesta Texas theme parks.
San Antonio has developed a growing cybersecurity sector, building on the military's extensive intelligence and information warfare operations at JBSA. The city is home to one of the largest concentrations of cybersecurity professionals in the nation, supported by the presence of the 24th Air Force (now 16th Air Force), the National Security Agency's Texas Cryptologic Center, and numerous defense contractors specializing in cyber operations. For security professionals, see Texas Security Authority. For contractors serving the San Antonio market, see San Antonio Contractor Authority.
The Rio Grande Valley
The Rio Grande Valley, commonly referred to simply as "the Valley," encompasses the southernmost tip of Texas where the Rio Grande curves southward before emptying into the Gulf of Mexico. The Valley is anchored by Hidalgo County (population approximately 870,000, including the cities of McAllen, Edinburg, Pharr, and Mission) and Cameron County (population approximately 420,000, including Brownsville, Harlingen, and San Benito). The combined Valley population exceeds 1.3 million residents, making it one of the most densely populated and culturally distinctive subregions in Texas.
The Valley's population is more than 90 percent Hispanic, and the region's cultural identity is deeply shaped by its position on the U.S.-Mexico border. Spanish and English are used interchangeably in daily life, and the cultural, economic, and family ties between communities on both sides of the border create a binational social fabric that is unique in the United States. The region's economy has historically been built on agriculture -- the Valley's subtropical climate supports winter vegetable and citrus production, with significant crops including onions, peppers, sugarcane, and grapefruit -- supplemented by international trade and retail activity driven by cross-border shopping.
The University of Texas Rio Grande Valley (UTRGV), formed from the merger of UT Pan American and UT Brownsville, has become a major institution with enrollment exceeding 30,000 students and a medical school that addresses the region's healthcare needs. The Valley has also attracted attention as a site for aerospace activity, with SpaceX's Starbase facility near Boca Chica Beach in Cameron County conducting development and testing of the Starship launch vehicle, the largest and most powerful rocket ever built.
Laredo and the USMCA Trade Corridor
Webb County, with a population of approximately 275,000 centered on the city of Laredo, is the busiest inland port in North America and one of the most important trade crossings in the Western Hemisphere. The World Trade Bridge, Laredo's primary commercial crossing, processes more than 16,000 trucks daily, and the Laredo customs district handles more international trade by value than any other port of entry in the United States -- exceeding $200 billion in annual trade value. This trade flow is driven by the USMCA (United States-Mexico-Canada Agreement) and the integrated manufacturing supply chains that move components and finished goods between factories in Mexico and markets in the United States.
Laredo's economy is overwhelmingly focused on trade and logistics, with customs brokerage, warehousing, transportation, and trade-related services employing a large portion of the workforce. The city's four international bridges connect it to Nuevo Laredo, Tamaulipas, Mexico, and Interstate 35 provides a direct highway corridor from the border to Dallas, Austin, San Antonio, and ultimately to the Canadian border in Minnesota. Texas A&M International University, located in Laredo, supports the region's workforce development needs with programs in international business, criminal justice, and education.
The Brush Country and Eagle Ford Shale
Between San Antonio and the Valley lies the Brush Country, a vast region of semi-arid ranchland characterized by mesquite, prickly pear, and chaparral vegetation. Historically devoted to cattle ranching and hunting (South Texas is one of the premier whitetail deer hunting regions in the nation), the Brush Country has been transformed by the development of the Eagle Ford Shale, a geological formation extending in an arc from the Mexican border northeast through more than a dozen counties. The Eagle Ford Shale has produced billions of barrels of oil and trillions of cubic feet of natural gas since drilling began in earnest in 2008, generating enormous economic activity in previously rural communities and creating pipeline and processing infrastructure that connects to Gulf Coast refineries.
The development of the Eagle Ford has had profound economic effects on South Texas communities, bringing employment, mineral royalties, and infrastructure investment to counties that had experienced decades of population decline. It has also created challenges including road damage from heavy truck traffic, housing shortages in small towns, and environmental concerns related to drilling and wastewater disposal. For electrical and infrastructure professionals working in the Eagle Ford region, see Texas Electrical Authority.
Cultural Heritage
South Texas possesses a cultural heritage that is distinct within the broader Texas identity. The region's Hispanic heritage predates Texas independence by more than a century -- many South Texas land grants trace to the Spanish colonial period, and communities including San Antonio, Laredo, and the Valley towns were established decades or centuries before Anglo-American settlement transformed the rest of the state. This heritage is reflected in architecture, cuisine (including the distinctive Tex-Mex culinary tradition that originated in San Antonio), music (particularly conjunto and Tejano music), and religious traditions centered on Catholicism.
The influence of this heritage extends across Texas and the nation. San Antonio's Tex-Mex food culture -- including the invention of chili con carne, nachos, and fajitas -- has become part of the national culinary vocabulary. The Tejano music tradition, blending Mexican norteño and polka influences with American rock, country, and R&B, has produced internationally recognized artists and a distinct musical identity. The annual Fiesta San Antonio, a 10-day citywide festival held each April, draws more than 3.5 million attendees and celebrates the multicultural heritage of the city and region. For comprehensive services and resources across South Texas, see Texas Service Authority.
For a complete overview of all Texas regions, see Texas Regions Overview. For information about the state's economy, see Texas Economy and Industries.