Geography of San Augustine County
San Augustine County is a rural county of 528 square miles and about 7,722 residents, where farms and ranches fill most of the space between San Augustine and its smaller communities.
It lies in the East Texas region at about 31.39° N, 94.17° W and is one of the 25 smallest counties in Texas (236th of 254 by area). San Augustine County shares boundaries with 5 other Texas counties, and the closest major cities are Beaumont (about 91 miles away in a straight line) and Tyler (about 94 miles).
East Texas is the state's forested corner — the Piney Woods, red-clay hills, lakes and river bottoms that have more in common with the Deep South than with the open West. Timber, poultry, oil and gas, and growing retirement and lake communities shape its economy.
For a broader view of how San Augustine 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 7,722 residents across 528 square miles, San Augustine County has a population density of about 14.6 people per square mile. Like much of West and South Texas, the county is sparsely populated, with wide-open country between settlements.
County seat: San Augustine
San Augustine is the county seat of San Augustine County, sharing its name with the county itself. This is where the county courthouse stands and where residents go for property records, vehicle registration, marriage licenses, court cases and voter services handled by the county clerk, district clerk and tax assessor-collector. For many residents, a trip to San Augustine combines county business with groceries, school events and church.
History & name origin
San Augustine County was established in 1836 and was named for Presumably Augustine of Hippo (354–430). It was carved from territory previously part of One of the original 23 counties.
San Augustine County, Texas — frequently asked questions
Quick answers about San Augustine 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 San Augustine County, Texas located?+
San Augustine County is located in the East Texas region of Texas at approximately 31.394° N, 94.168° W. It is one of the 254 counties of Texas and carries U.S. Census FIPS code 48405. The interactive map on this page renders the official U.S. Census TIGER boundary for San Augustine County over real-world OpenStreetMap, Esri satellite, and topographic basemaps.
How big is San Augustine County in square miles?+
San Augustine County covers approximately 528 square miles of land in the East Texas region — a compact county by Texas standards. By land area it ranks 236th 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 San Augustine County, Texas?+
San Augustine County has a population of approximately 7,722 residents. With 528 square miles of land, that works out to a population density of about 14.6 people per square mile, which is rural for a Texas county. That makes San Augustine County the 178th most populous of the 254 counties in Texas.
What is the county seat of San Augustine County?+
San Augustine is the county seat of San Augustine County, Texas, which was organized in 1836 and named for Presumably Augustine of Hippo (354–430). San Augustine County was originally carved out of One of the original 23 counties. County government offices, courthouses, and most public records for San Augustine County are located in San Augustine.
Which Texas counties border San Augustine County?+
San Augustine County shares borders with Jasper, Nacogdoches, Shelby, Angelina, and Sabine 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 East Texas region.
Where can I download or print a map of San Augustine County?+
Use the "Download PDF" button below the San Augustine 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 San Augustine 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 San Augustine County, Texas?+
The full 5-digit U.S. Census FIPS code for San Augustine County is 48405, made up of Texas state code 48 and the 3-digit county code 405. 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.