Williamson County GIS Maps

Williamson County Maps

The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.

County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.

Williamson County Parcels

Williamson County has 282,570 mapped parcels covering 683,399 acres. The median assessed value is $395,241. The records carry 224,502 distinct owner names. About 6% of parcels list an owner mailing address outside Texas. Owner names, mailing addresses, site addresses, assessed values and lot sizes are on nearly every parcel. Browse the interactive Williamson County Parcel viewer here.

Williamson County Parcel Data Coverage

Field coverage measured across all Williamson County parcel records. Download free sample data here.

Williamson County Population

Williamson County had 609,017 residents in 2020. That was 44.1% higher than in 2010. Williamson County added 359,050 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 545 people per square mile. Some of the county's most populated postal areas include Cedar Park, Round Rock and Round Rock.

Population Trend in Williamson County TX

Williamson County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.

Williamson County Zip Codes

Williamson County has 19 zip codes. Some of the county's most populated zip codes include Cedar Park (78613), Round Rock (78665) and Round Rock (78664). Cedar Park is the largest zip by population, with about 89,279 residents or 15% of the county total. Together, the three largest zips account for about 35% of all county residents based on 2020 population estimates.

Most Populated Zip Codes in Williamson County TX

Williamson County Zip Code populations and trends per most recent census data.

Williamson County Demographics

Williamson County has a median age of 37.2, which makes the county a little older than Texas overall. About 24.5% of residents are under 18, while 12.8% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 38.2% of the population, which points to a solid working-age base. About 47.4% of adults have a bachelor's degree or higher, above the statewide figure of 33.1%. The county has a more diverse population mix, with no single race or ethnicity accounting for all of the local story.

Key Demographics for Williamson County TX

Williamson County School Districts

Williamson County is served by 14 public school districts with 138,211 students enrolled in 2024. The largest districts on the county map are Round Rock Independent, Leander Independent and Georgetown Independent. Those three districts account for about 75% of public school enrollment in the map area. Total enrollment has grown modestly since 2017 across the districts shown on the county map.

Largest School Districts by Enrollment in Williamson County TX

Williamson County school district enrollment and trends per most recent NCES reporting data.

Williamson County Housing & Real Estate

Williamson County has a median home value of $414,600 and a median gross rent of $1,720. About 67% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Texas median, while rents come in above the state average. In March 2026, the median listing price was $427,995 and homes spent about 54 days on the market.

Businesses in Williamson County, TX

Williamson County has 24,664 business listings across 1,078 categories. The largest categories in Williamson County business listings are Real Estate Agents (584, 2.4%), Churches & Religious Organizations (417, 1.7%), and Hair Salons (384, 1.6%). The full Williamson County business listings dataset includes names, categories, addresses and contact details where available. Williamson County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.

Top Business Categories in Williamson County, TX

Williamson County Business Listings

Williamson County business listings sourced from Overture Maps. Includes locations with a high level of confidence.

Williamson County Basemaps

Williamson County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.

Preview a Live Package Demo

See exactly what is included in a county data package. Inspect how files are organized, the interactive data explorer and how maps and analytics are laid out. The demo loads a real sample package from Texas — explore the full structure before you buy.