Geography of Williamson County
With roughly 752,827 residents, Williamson County is among the most heavily populated places in Texas — a metropolitan county where city limits, suburbs and highways now cover much of its 1,124 square miles.
It lies in the Central Texas region at about 30.65° N, 97.60° W and is 46th in size among Texas's 254 counties. Williamson County shares boundaries with 6 other Texas counties, and the closest major cities are Austin (about 27 miles away in a straight line) and Waco (about 68 miles).
Central Texas stretches across the Hill Country, the Blackland Prairie and the Cross Timbers. It includes some of the fastest-growing suburbs in the nation along the I-35 corridor, alongside quiet ranching counties with limestone creeks and live-oak savanna.
For a broader view of how Williamson County fits within the state, download our free Texas map with counties and cities PDF — a printable, high-resolution reference showing all 254 Texas counties labeled with their county seats.
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
County government for Williamson County is based in Georgetown. The commissioners court, made up of a county judge and four precinct commissioners, meets here and sets the county budget, roads policy and tax rate. In a county this large, many services are also offered at satellite offices across the county.
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. Figures are sourced from the U.S. Census Bureau; answers are written and reviewed by the Texas County Map team.
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?+
Use the "Download PDF" button below the Williamson County map on this page to save a letter-size PDF of the county boundary, neighboring counties and incorporated places, drawn from U.S. Census Bureau 2023 boundary files. The "Official TxDOT road map" button downloads the Texas Department of Transportation county road mapbook for Williamson County. Both files are stored on this site and download directly. Our free Texas map with counties and cities PDF shows all 254 counties on one sheet.
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.