Geography of Dimmit County
Dimmit County is a rural county of 1,331 square miles and about 8,024 residents, where farms and ranches fill most of the space between Carrizo Springs and its smaller communities.
It lies in the South Texas region at about 28.42° N, 99.76° W and is 29th in size among Texas's 254 counties. Dimmit County shares boundaries with 5 other Texas counties, and the closest major cities are Laredo (about 65 miles away in a straight line) and San Antonio (about 103 miles).
South Texas covers the brush country, the Rio Grande Valley and the ranchlands south of San Antonio. Its culture is strongly shaped by its Tejano heritage and its ties to Mexico, and its economy blends citrus and vegetable farming, ranching, trade and energy.
For a broader view of how Dimmit County fits within the state, download our free Texas map with counties and cities PDF — a printable, high-resolution reference showing all 254 Texas counties labeled with their county seats.
Population & demographics
With approximately 8,024 residents across 1,331 square miles, Dimmit County has a population density of about 6.0 people per square mile. Like much of West and South Texas, the county is sparsely populated, with wide-open country between settlements.
County seat: Carrizo Springs
If you need an official record from Dimmit County — a deed, a birth certificate, a court filing — Carrizo Springs is where it is kept. Like every Texas county seat, it hosts the courthouse and the main offices of county government. For many residents, a trip to Carrizo Springs combines county business with groceries, school events and church.
History & name origin
Dimmit County was established in 1858 and was named for Philip Dimmitt, a major figure in the Texas Revolution. It was carved from territory previously part of Bexar County, Maverick County, Uvalde County and Webb County.
Dimmit County, Texas — frequently asked questions
Quick answers about Dimmit County geography, population, county seat, neighboring counties, and how to use the maps on this page. Figures are sourced from the U.S. Census Bureau; answers are written and reviewed by the Texas County Map team.
Where is Dimmit County, Texas located?+
Dimmit County is located in the South Texas region of Texas at approximately 28.422° N, 99.757° W. It is one of the 254 counties of Texas and carries U.S. Census FIPS code 48127. The interactive map on this page renders the official U.S. Census TIGER boundary for Dimmit County over real-world OpenStreetMap, Esri satellite, and topographic basemaps.
How big is Dimmit County in square miles?+
Dimmit County covers approximately 1,331 square miles of land in the South Texas region — a mid-sized Texas county. By land area it ranks 29th out of 254 Texas counties. The full bounding box of the county is rendered to scale on the interactive map and matches the U.S. Census TIGER 2023 polygon.
What is the population of Dimmit County, Texas?+
Dimmit County has a population of approximately 8,024 residents. With 1,331 square miles of land, that works out to a population density of about 6.0 people per square mile, which is sparsely populated for a Texas county. That makes Dimmit County the 176th most populous of the 254 counties in Texas.
What is the county seat of Dimmit County?+
Carrizo Springs is the county seat of Dimmit County, Texas, which was organized in 1858 and named for Philip Dimmitt, a major figure in the Texas Revolution. Dimmit County was originally carved out of Bexar County, Maverick County, Uvalde County and Webb County. County government offices, courthouses, and most public records for Dimmit County are located in Carrizo Springs.
Which Texas counties border Dimmit County?+
Dimmit County shares borders with Zavala, Maverick, La Salle, Webb, and Frio counties. These 5 neighboring counties are highlighted on the schematic boundary map and linked at the bottom of this page so you can quickly compare population, area, and county seats across the South Texas region.
Where can I download or print a map of Dimmit County?+
Use the "Download PDF" button below the Dimmit County map on this page to save a letter-size PDF of the county boundary, neighboring counties and incorporated places, drawn from U.S. Census Bureau 2023 boundary files. The "Official TxDOT road map" button downloads the Texas Department of Transportation county road mapbook for Dimmit County. Both files are stored on this site and download directly. Our free Texas map with counties and cities PDF shows all 254 counties on one sheet.
What is the FIPS code for Dimmit County, Texas?+
The full 5-digit U.S. Census FIPS code for Dimmit County is 48127, made up of Texas state code 48 and the 3-digit county code 127. This is the same FIPS code used by the U.S. Census Bureau TIGER/Line files, the American Community Survey, and most federal datasets that key on county.