Geography of Dallam County
Dallam County sits at roughly 36.28° N and 102.60° W in the West Texas region of Texas, spanning 1,505 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 Dalhart, and the county shares boundaries with 2 neighboring counties.
Population & demographics
With approximately 7,508 residents across 1,505 square miles, Dallam County has a population density of about 5.0 people per square mile. Like much of West and South Texas, the county is sparsely populated, with wide-open country between settlements.
County seat: Dalhart
Dalhart serves as the seat of government for Dallam 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
Dallam County was established in 1876 and was named for James Wilmer Dallam, a lawyer and newspaper publisher who had a close association with the Supreme Court of Texas. It was carved from territory previously part of Bexar County.
Dallam County, Texas — frequently asked questions
Quick answers about Dallam 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 Dallam County, Texas located?+
Dallam County is located in the West Texas region of Texas at approximately 36.278° N, 102.602° W. It is one of the 254 counties of Texas and carries U.S. Census FIPS code 48111. The interactive map on this page renders the official U.S. Census TIGER boundary for Dallam County over real-world OpenStreetMap, Esri satellite, and topographic basemaps.
How big is Dallam County in square miles?+
Dallam County covers approximately 1,505 square miles of land in the West Texas region — a large county by Texas standards. By land area it ranks 18th 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 Dallam County, Texas?+
Dallam County has a population of approximately 7,508 residents. With 1,505 square miles of land, that works out to a population density of about 5.0 people per square mile, which is sparsely populated for a Texas county. That makes Dallam County the 180th most populous of the 254 counties in Texas.
What is the county seat of Dallam County?+
Dalhart is the county seat of Dallam County, Texas, which was organized in 1876 and named for James Wilmer Dallam, a lawyer and newspaper publisher who had a close association with the Supreme Court of Texas. Dallam County was originally carved out of Bexar County. County government offices, courthouses, and most public records for Dallam County are located in Dalhart.
Which Texas counties border Dallam County?+
Dallam County shares borders with Hartley and Sherman counties. These 2 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 Dallam County?+
A free, print-ready PDF map of Dallam 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 Dallam 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 Dallam County, Texas?+
The full 5-digit U.S. Census FIPS code for Dallam County is 48111, made up of Texas state code 48 and the 3-digit county code 111. 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.