Counties in the South Texas region
All 26 counties, sorted alphabetically. Click any county for its full profile, map, and demographics.
Geography & character of South Texas
South Texas blends the Rio Grande Valley's bilingual border culture with brush country ranching and the urban energy of San Antonio and Laredo. Agriculture, cross-border trade, and tourism along the Gulf and the river shape daily life.
Together, the 26 counties of the South Texas region cover roughly 32,935 square miles — that's 12.3% of Texas's total land area — and are home to about 4,100,117 residents, or roughly 124.5 people per square mile. The most populous county in the region is Bexar County (about 2,160,088 residents), while the largest by land area is Webb County (3,357 sq mi).
Frequently asked questions
How many counties are in the South Texas region?+
The South Texas region contains 26 of Texas's 254 counties.
Which is the largest county in South Texas by population?+
Bexar County, with about 2,160,088 residents.
Which is the smallest county in South Texas by population?+
McMullen County, with about 544 residents.
What is the total area of the South Texas region?+
Approximately 32,935 square miles across all 26 counties.
How can I see a real map of the South Texas region?+
Use the interactive map at the top of this page — toggle Roads, Terrain, or Satellite basemaps to view authentic geography from Esri imagery, with all 26 county boundaries drawn from Census TIGER data.