Geography of San Jacinto County
San Jacinto County sits at roughly 30.58° N and 95.17° W in the East Texas region of Texas, spanning 571 square miles of terrain that includes the landscape characteristic of the area — from open ranchland and farmland to small-town main streets. The county's centroid is near Coldspring, and the county shares boundaries with 5 neighboring counties.
Population & demographics
With approximately 29,488 residents across 571 square miles, San Jacinto County has a population density of about 51.6 people per square mile. Density here reflects a mix of small cities, suburbs, and rural land.
County seat: Coldspring
Coldspring serves as the seat of government for San Jacinto County. The county courthouse, commissioners court, district clerk, and primary public records are located here. As with all 254 Texas counties, the county seat is the anchor of civic life and the principal address for elections, permits, and court filings.
History & name origin
San Jacinto County was established in 1870 and was named for The Battle of San Jacinto, which won Texas its independence from Mexico. San Jacinto is Spanish for Saint Hyacinth. It was carved from territory previously part of Liberty County, Montgomery County, Polk County and Walker County.
San Jacinto County, Texas — frequently asked questions
Quick answers about San Jacinto County geography, population, county seat, neighboring counties, and how to use the maps on this page. Every answer is generated from the official U.S. Census data backing this site.
Where is San Jacinto County, Texas located?+
San Jacinto County is located in the East Texas region of Texas at approximately 30.579° N, 95.167° W. It is one of the 254 counties of Texas and carries U.S. Census FIPS code 48407. The interactive map on this page renders the official U.S. Census TIGER boundary for San Jacinto County over real-world OpenStreetMap, Esri satellite, and topographic basemaps.
How big is San Jacinto County in square miles?+
San Jacinto County covers approximately 571 square miles of land in the East Texas region — a compact county by Texas standards. By land area it ranks 233rd 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 Jacinto County, Texas?+
San Jacinto County has a population of approximately 29,488 residents. With 571 square miles of land, that works out to a population density of about 51.6 people per square mile, which is moderately populated for a Texas county. That makes San Jacinto County the 97th most populous of the 254 counties in Texas.
What is the county seat of San Jacinto County?+
Coldspring is the county seat of San Jacinto County, Texas, which was organized in 1870 and named for The Battle of San Jacinto, which won Texas its independence from Mexico. San Jacinto is Spanish for Saint Hyacinth. San Jacinto County was originally carved out of Liberty County, Montgomery County, Polk County and Walker County. County government offices, courthouses, and most public records for San Jacinto County are located in Coldspring.
Which Texas counties border San Jacinto County?+
San Jacinto County shares borders with Montgomery, Polk, Trinity, Liberty, and Walker 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 Jacinto County?+
A free, print-ready PDF map of San Jacinto County is available from the "Download PDF" button at the top of this page. The printable layout uses authentic U.S. Census TIGER boundary geometry for San Jacinto County, includes a Texas locator inset, and is sized for standard 8.5" × 11" Letter paper. For interactive use, the live Leaflet map on this page supports OpenStreetMap, Esri satellite, Esri topographic, and Carto light basemaps with zoom, scale bar, and fullscreen.
What is the FIPS code for San Jacinto County, Texas?+
The full 5-digit U.S. Census FIPS code for San Jacinto County is 48407, made up of Texas state code 48 and the 3-digit county code 407. 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.