Population overview
Williamson County is home to roughly 752,827 people, making up about 2.37% of the total population of Texas. Within the Central Texas region, it ranks #2 of 76 counties by population. The combination of 1,124 square miles of land and 752,827 residents yields a density of about 669.8 people per square mile — typical of suburban Texas, with a mix of subdivisions, commercial corridors, and remaining rural land.
How Williamson County compares
Compared with the other 253 Texas counties, Williamson County sits in the top 10% of the population distribution. It belongs to the upper tier of Texas counties — sizable enough to support diverse local services and infrastructure.
| Comparison | Population | vs Williamson |
|---|---|---|
| Williamson County | 752,827 | — |
| Central Texas region average | 81,016 | -89% |
| Texas county median | 18,916 | -97% |
| Largest in Texas (Harris) | 5,045,026 | +570% |
Neighboring county populations
Williamson County shares borders with 6 counties. Comparing population across an adjacent corridor often reveals commuting patterns, school-district pull, and economic gravity.
| County | Seat | Population | Density |
|---|---|---|---|
| Travis County | Austin | 1,389,670 | 1405.1 |
| Bell County | Belton | 402,248 | 379.8 |
| Bastrop County | Bastrop | 118,908 | 133.9 |
| Burnet County | Burnet | 57,015 | 57.3 |
| Milam County | Cameron | 26,258 | 25.8 |
| Lee County | Giddings | 18,729 | 29.8 |
What the numbers mean
Williamson County's density of about 669.8 people per square mile is 5.5 times the Texas statewide average of roughly 121. Put another way, there are about 0.96 acres of land for every resident.
A density this high means most residents live in incorporated cities and continuous suburbs. Population size drives the county's large budget, its many courts and precincts, and its weight in statewide elections — a county of this size elects multiple state representatives on its own.
Williamson County in statewide context
By population the county ranks 12th of 254; by land area it ranks 46th; and by density it ranks 13th. Its population and land area rank fairly close together, a balanced profile for Texas.
Texas's population is extremely concentrated: the ten largest counties hold well over half of all Texans, while more than 150 counties have fewer than 30,000 residents. Williamson County sits in the middle ground between the big metros and the rural majority.
About the data
Population figures on this page come from the U.S. Census Bureau. The decennial census provides the official count every ten years, and the Bureau's annual Population Estimates Program updates county totals between censuses. Land area comes from the Census Gazetteer and excludes water. Figures are rounded and may differ slightly from county or school district estimates that use other methods. See our methodology page for details.
Frequently asked questions
What is the population of Williamson County, Texas?+
Williamson County has an estimated population of 752,827 residents, based on the most recent U.S. Census data.
What is the population density of Williamson County?+
Williamson County has a population density of approximately 669.8 people per square mile across its 1,124 sq mi of land area — characteristic of a suburban county.
Where does Williamson County rank among Texas counties by population?+
Williamson County ranks #12 out of 254 Texas counties by total population, accounting for roughly 2.37% of the state's total population.
What is the most populous county near Williamson County?+
Among the 6 counties bordering Williamson, Travis County is the most populous with about 1,389,670 residents.
How is Williamson County's population measured?+
Population figures are sourced from the U.S. Census Bureau — the decennial census and annual American Community Survey (ACS) population estimates. See our methodology for full sourcing.