Geography of Castro County
Castro County sits at roughly 34.53° N and 102.26° W in the West Texas region of Texas, spanning 898 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 Dimmitt, and the county shares boundaries with 6 neighboring counties.
Population & demographics
With approximately 7,295 residents across 898 square miles, Castro County has a population density of about 8.1 people per square mile. Like much of West and South Texas, the county is sparsely populated, with wide-open country between settlements.
County seat: Dimmitt
Dimmitt serves as the seat of government for Castro 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
Castro County was established in 1876 and was named for Henri Castro (1786–1865), a French consul general for the Republic of Texas and founder of a colony in Texas. It was carved from territory previously part of Bexar County.
Castro County, Texas — frequently asked questions
Quick answers about Castro 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 Castro County, Texas located?+
Castro County is located in the West Texas region of Texas at approximately 34.530° N, 102.262° W. It is one of the 254 counties of Texas and carries U.S. Census FIPS code 48069. The interactive map on this page renders the official U.S. Census TIGER boundary for Castro County over real-world OpenStreetMap, Esri satellite, and topographic basemaps.
How big is Castro County in square miles?+
Castro County covers approximately 898 square miles of land in the West Texas region — a mid-sized Texas county. By land area it ranks 159th 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 Castro County, Texas?+
Castro County has a population of approximately 7,295 residents. With 898 square miles of land, that works out to a population density of about 8.1 people per square mile, which is sparsely populated for a Texas county. That makes Castro County the 183rd most populous of the 254 counties in Texas.
What is the county seat of Castro County?+
Dimmitt is the county seat of Castro County, Texas, which was organized in 1876 and named for Henri Castro (1786–1865), a French consul general for the Republic of Texas and founder of a colony in Texas. Castro County was originally carved out of Bexar County. County government offices, courthouses, and most public records for Castro County are located in Dimmitt.
Which Texas counties border Castro County?+
Castro County shares borders with Hale, Lamb, Swisher, Parmer, Randall, and Deaf Smith 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 West Texas region.
Where can I download or print a map of Castro County?+
A free, print-ready PDF map of Castro 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 Castro 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 Castro County, Texas?+
The full 5-digit U.S. Census FIPS code for Castro County is 48069, made up of Texas state code 48 and the 3-digit county code 069. 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.