Geography of Williamson County
Williamson County sits at roughly 30.65° N and 97.60° W in the Central Texas region of Texas, spanning 1,124 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 Georgetown, and the county shares boundaries with 6 neighboring counties.
Population & demographics
With approximately 752,827 residents across 1,124 square miles, Williamson County has a population density of about 669.8 people per square mile. It ranks among the more densely populated counties in Texas — a clear sign of metropolitan urbanization.
County seat: Georgetown
Georgetown serves as the seat of government for Williamson 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
Williamson County was established in 1848 and was named for Robert McAlpin Williamson, a leader and veteran of the Battle of San Jacinto. It was carved from territory previously part of Milam County.
Williamson County, Texas — frequently asked questions
Quick answers about Williamson 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 Williamson County, Texas located?+
Williamson County is located in the Central Texas region of Texas at approximately 30.648° N, 97.601° W. It is one of the 254 counties of Texas and carries U.S. Census FIPS code 48491. The interactive map on this page renders the official U.S. Census TIGER boundary for Williamson County over real-world OpenStreetMap, Esri satellite, and topographic basemaps.
How big is Williamson County in square miles?+
Williamson County covers approximately 1,124 square miles of land in the Central Texas region — a mid-sized Texas county. By land area it ranks 46th 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 Williamson County, Texas?+
Williamson County has a population of approximately 752,827 residents. With 1,124 square miles of land, that works out to a population density of about 669.8 people per square mile, which is densely populated for a Texas county. That makes Williamson County the 12th most populous of the 254 counties in Texas.
What is the county seat of Williamson County?+
Georgetown is the county seat of Williamson County, Texas, which was organized in 1848 and named for Robert McAlpin Williamson, a leader and veteran of the Battle of San Jacinto. Williamson County was originally carved out of Milam County. County government offices, courthouses, and most public records for Williamson County are located in Georgetown.
Which Texas counties border Williamson County?+
Williamson County shares borders with Lee, Travis, Milam, Bastrop, Bell, and Burnet 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 Williamson County?+
A free, print-ready PDF map of Williamson 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 Williamson 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 Williamson County, Texas?+
The full 5-digit U.S. Census FIPS code for Williamson County is 48491, made up of Texas state code 48 and the 3-digit county code 491. 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.