Geography of Irion County
Irion County sits at roughly 31.30° N and 100.98° W in the Central Texas region of Texas, spanning 1,052 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 Mertzon, and the county shares boundaries with 4 neighboring counties.
Population & demographics
With approximately 1,463 residents across 1,052 square miles, Irion County has a population density of about 1.4 people per square mile. Like much of West and South Texas, the county is sparsely populated, with wide-open country between settlements.
County seat: Mertzon
Mertzon serves as the seat of government for Irion 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
Irion County was established in 1889 and was named for Robert Anderson Irion (1804–1861), a secretary of state in the Republic of Texas. It was carved from territory previously part of Tom Green County.
Irion County, Texas — frequently asked questions
Quick answers about Irion 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 Irion County, Texas located?+
Irion County is located in the Central Texas region of Texas at approximately 31.304° N, 100.983° W. It is one of the 254 counties of Texas and carries U.S. Census FIPS code 48235. The interactive map on this page renders the official U.S. Census TIGER boundary for Irion County over real-world OpenStreetMap, Esri satellite, and topographic basemaps.
How big is Irion County in square miles?+
Irion County covers approximately 1,052 square miles of land in the Central Texas region — a mid-sized Texas county. By land area it ranks 64th 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 Irion County, Texas?+
Irion County has a population of approximately 1,463 residents. With 1,052 square miles of land, that works out to a population density of about 1.4 people per square mile, which is sparsely populated for a Texas county. That makes Irion County the 239th most populous of the 254 counties in Texas.
What is the county seat of Irion County?+
Mertzon is the county seat of Irion County, Texas, which was organized in 1889 and named for Robert Anderson Irion (1804–1861), a secretary of state in the Republic of Texas. Irion County was originally carved out of Tom Green County. County government offices, courthouses, and most public records for Irion County are located in Mertzon.
Which Texas counties border Irion County?+
Irion County shares borders with Reagan, Crockett, Schleicher, and Tom Green counties. These 4 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 Irion County?+
A free, print-ready PDF map of Irion 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 Irion 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 Irion County, Texas?+
The full 5-digit U.S. Census FIPS code for Irion County is 48235, made up of Texas state code 48 and the 3-digit county code 235. 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.