Property Tax & Income in Williamson County, Texas
Williamson County has an effective property tax rate of 1.61%. On the median home value of $447,000, that's roughly $7,205 per year. Median household income is $111,340.
What you'll pay, at a glance
Property taxes are the largest local tax most homeowners pay. The effective rate measures the real tax bill as a share of home value — a more useful number than the nominal “mill rate,” because assessment practices vary county to county.
| Metric | Williamson County | Texas (state context) |
|---|---|---|
| Effective property tax rate1 | 1.61% | 1.18% |
| Median home value1 | $447,000 | — |
| State income tax3 | No state income tax | No state income tax |
| State sales tax3 | 8.20% combined | 8.20% combined |
How this is calculated
The effective property tax rate is the median real-estate tax bill divided by the median home value — both for owner-occupied homes, from the U.S. Census Bureau's American Community Survey (ACS 5-year estimates)1. Median income is also from the ACS1. Federal and state income-tax figures use IRS2 and Tax Foundation3 data.
About Williamson County, TX
Williamson County’s effective property tax rate of 1.612% sits well above both the Texas median of 1.183% and the national median of 0.794%. That gap signals a heavier reliance on property taxes to fund local services than is common elsewhere. A median home value of $447,000 produces an annual tax bill of about $7,205, a meaningful expense even against a median household income of $111,340. The county ranks 26th out of 250 Texas counties for its rate, placing it in the higher tier statewide. Communities such as Round Rock and Georgetown anchor this fast-growing area north of Austin, where rising home values and elevated rates combine to shape what owners owe each year.