Geography of Mason County
Mason County sits at roughly 30.72° N and 99.23° W in the Central Texas region of Texas, spanning 932 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 Mason, and the county shares boundaries with 6 neighboring counties.
Population & demographics
With approximately 3,990 residents across 932 square miles, Mason County has a population density of about 4.3 people per square mile. Like much of West and South Texas, the county is sparsely populated, with wide-open country between settlements.
County seat: Mason
Mason serves as the seat of government for Mason 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
Mason County was established in 1858 and was named for Fort Mason, which was named for either Lt. George T. Mason, killed during the Mexican–American War in fighting near Brownsville, or for Gen. Richard Barnes Mason, military governor of California. It was carved from territory previously part of Gillespie County.
Mason County, Texas — frequently asked questions
Quick answers about Mason 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 Mason County, Texas located?+
Mason County is located in the Central Texas region of Texas at approximately 30.718° N, 99.226° W. It is one of the 254 counties of Texas and carries U.S. Census FIPS code 48319. The interactive map on this page renders the official U.S. Census TIGER boundary for Mason County over real-world OpenStreetMap, Esri satellite, and topographic basemaps.
How big is Mason County in square miles?+
Mason County covers approximately 932 square miles of land in the Central Texas region — a mid-sized Texas county. By land area it ranks 97th 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 Mason County, Texas?+
Mason County has a population of approximately 3,990 residents. With 932 square miles of land, that works out to a population density of about 4.3 people per square mile, which is sparsely populated for a Texas county. That makes Mason County the 208th most populous of the 254 counties in Texas.
What is the county seat of Mason County?+
Mason is the county seat of Mason County, Texas, which was organized in 1858 and named for Fort Mason, which was named for either Lt. George T. Mason, killed during the Mexican–American War in fighting near Brownsville, or for Gen. Richard Barnes Mason, military governor of California. Mason County was originally carved out of Gillespie County. County government offices, courthouses, and most public records for Mason County are located in Mason.
Which Texas counties border Mason County?+
Mason County shares borders with Menard, San Saba, McCulloch, Kimble, Llano, and Gillespie counties. These 6 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 Central Texas region.
Where can I download or print a map of Mason County?+
A free, print-ready PDF map of Mason 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 Mason 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 Mason County, Texas?+
The full 5-digit U.S. Census FIPS code for Mason County is 48319, made up of Texas state code 48 and the 3-digit county code 319. 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.