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Williamson County, TX Parcels & GIS Data

Williamson County, TX parcel data: 286,901 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes Williamson County, Texas parcel data covering 286,901 property records.

This page documents parcel-level coverage for Williamson County, Texas. Each parcel record carries its boundary polygon (GIS geometry) along with attributes such as the parcel ID/APN, owner name and mailing address, situs (property) address, assessed land and improvement values, acreage, land-use and zoning codes, year built, and most recent sale price and date. Exact fill rates for Williamson County are listed in the attribute-coverage table below. Preview the data in the interactive explorer, or download the complete Williamson County property dataset.

Williamson County is a county in the U.S. state of Texas. As of the 2020 census, its population was 609,017. The 2025 population estimate was 752,827.

FIPS 48491

Official county website: http://wilco.org

The FIPS code for Williamson County is 48491.

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Attribute coverage

Williamson County contains 286,901 parcels in the current dataset. Column coverage is the percentage of those parcels for which the attribute is populated (non-NULL).

ColumnCoverageRecords populated
lrid100%286,901
parcelid100%286,901
parcelid299.3%284,979
ogparcelid100%286,901
ogparcelid299.3%284,979
parentid<0.1%0
stackid<0.1%0
geoid100%286,901
statefp100%286,901
countyfp100%286,901
countyname100%286,901
cousubfp100%286,901
cousubname100%286,901
tractce100%286,901
tractname100%286,901
taxacctnum100%286,900
taxyear<0.1%0
taxdistrict99.3%284,979
usecode100%286,900
usedesc100%286,900
zoningcode9.5%27,147
zoningdesc9.5%27,146
numbldgs90.5%259,548
numunits<0.1%0
yearbuilt<0.1%0
numfloors<0.1%0
bldgsqft<0.1%0
bedrooms<0.1%0
halfbaths<0.1%0
fullbaths<0.1%0
imprvalue<0.1%0
landvalue<0.1%0
agvalue<0.1%0
totalvalue<0.1%0
taxacres34.5%98,840
calcarea100%286,901
saleamt<0.1%0
saledate<0.1%0
ownertype99.3%284,979
ownername99.3%284,979
owneraddr99.3%284,788
ownercity99.2%284,478
ownerstate99.2%284,475
ownerzip99.2%284,473
parceladdr100%286,895
parcelcity100%286,886
parcelstate100%286,901
parcelzip100%286,901
legaldesc99.3%284,979
township<0.1%0
section<0.1%0
qtrsection<0.1%0
range<0.1%0
plssdesc<0.1%0
book<0.1%0
page<0.1%0
block<0.1%7
lot86.2%247,380
parceltype<0.1%0
accesstype<0.1%0
iucnclass<0.1%0
placename3.0%8,531
placetype2.9%8,377
firmid100%286,796
firmdate100%286,796
fldzone100%286,796
zonesubty98.7%283,309
staticbfe<0.1%120
elevmin<0.1%0
elevmax<0.1%0
elevavg<0.1%0
fireplaces<0.1%0
heating<0.1%0
heatfuel<0.1%0
cooling<0.1%0
foundation<0.1%0
roofcover<0.1%0
siding<0.1%0
bldgtype<0.1%0
naicscode1.2%3,305
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated100%286,901
centroidx100%286,901
centroidy100%286,901
surfpointx100%286,901
surfpointy100%286,901
geom100%286,901
extras<0.1%0
ownerlist99.2%284,746
placefp68.0%195,038
zoningurl<0.1%0

Schema mapping

How source columns from the acquired Williamson County GIS layers map into the harmonized entity schemas and assemble into the published parcel table, alongside supplemented fields (elevation, flood zone) and deterministic columns.

Schema mapping — Williamson County, Texas (48491) 1 entity · most recent acquisition per entity · generated 2026-08-30 direct column transformed (expression) geometry extras json supplemented determined ALL ENTITIES → FINAL PARCEL SCHEMA Harmonized entity columns assemble into publish.parcel_layer — matched by column name. Supplemented fields show their fill rate in this county. SOURCE COLUMNS HARMONIZED ENTITIES PUBLISH.PARCEL_LAYER ZONING geom use_ descr usecat ord notes prop_id alt_propid site arch acres caseno histord zoningdate annex smartcode creator createdate lasteditor lasteditdate pud_name pud_base usedes comp_use geom zoningcode zoningdesc zoningtype ordinance notes extras determined · ground truth 100% lrid 100% geoid 100% statefp 100% countyfp 100% countyname 100% cousubfp 100% cousubname 100% tractce 100% tractname 100% updated geom · derived from geometry geom s_fld_haz_ar · FEMA NFHL 100% fldzone 98.7% zonesubty 0.0% staticbfe 100% firmdate 100% firmid supplemented · derived / other pipelines 100% parcelid 99.3% parcelid2 100% ogparcelid 99.3% ogparcelid2 100% taxacctnum 99.3% taxdistrict 100% usecode 100% usedesc 90.5% numbldgs 99.3% ownertype 99.3% ownername 99.3% owneraddr 99.2% ownercity 99.2% ownerstate 99.2% ownerzip 100% parceladdr 100% parcelcity 100% parcelstate 100% parcelzip 99.3% legaldesc 86.2% lot 99.2% ownerlist 68.0% placefp lrid parcelid parcelid2 ogparcelid ogparcelid2 geoid statefp countyfp countyname cousubfp cousubname tractce tractname taxacctnum taxdistrict usecode usedesc zoningcode zoningdesc numbldgs calcarea ownertype ownername owneraddr ownercity ownerstate ownerzip parceladdr parcelcity parcelstate parcelzip legaldesc lot firmid firmdate fldzone zonesubty staticbfe updated centroidx centroidy surfpointx surfpointy geom extras ownerlist placefp publish.parcel_layer columns not fed by these sources (48) — empty or below 50% fill in this county parentid, stackid, taxyear, numunits, yearbuilt, numfloors, bldgsqft, bedrooms, halfbaths, fullbaths, imprvalue, landvalue, agvalue, totalvalue taxacres, saleamt, saledate, township, section, qtrsection, range, plssdesc, book, page, block, parceltype, accesstype, iucnclass, placename placetype, elevmin, elevmax, elevavg, fireplaces, heating, heatfuel, cooling, foundation, roofcover, siding, bldgtype, naicscode, frsid, dfrurl caapermit, cwapermit, rcrapermit, zoningurl ZONING 7 mapped · 1 transformed · 3 unmapped (NULL) SOURCE COLUMNS HARMONIZED → ZONING geom use_ descr usecat ord notes prop_id alt_propid site arch acres caseno histord zoningdate annex smartcode creator createdate lasteditor lasteditdate pud_name pud_base usedes comp_use geom zoningcode zoningdesc zoningtype ordinance notes extras json_build_object( 'prop_id', prop_id::text, 'alt_propid', alt_… not present in source — filled with NULL (3) setbacks, restrictions, sourceurl

Neighboring counties

Parcel data for counties bordering Williamson County:

Frequently asked questions

Where can I find Williamson County, TX parcel and GIS data?

Land Records publishes a Williamson County, TX parcel dataset in which every parcel carries its boundary polygon (GIS geometry) along with ownership, assessed value, land use, acreage, and sale history. Preview it in the interactive explorer on this page, or download the full Williamson County, TX dataset as a GeoPackage or CSV.

How many parcels are in Williamson County, TX?

The current dataset contains 286,901 parcel records for Williamson County, TX, each with its boundary geometry and assessor attributes.

What is the FIPS code for Williamson County, TX?

The FIPS code for Williamson County, TX is 48491.

What information does each Williamson County, TX parcel record include?

Each Williamson County, TX parcel record includes the parcel ID/APN, owner name and mailing address, situs (property) address, assessed land and improvement values, acreage, land-use and zoning codes, year built, and the most recent sale price and date — plus the parcel boundary polygon. Per-attribute fill rates are listed in the coverage table on this page.

Is Williamson County, TX parcel data free?

You can preview Williamson County, TX parcels for free in the interactive explorer. The complete dataset is available as a one-time download or through the nationwide parcel web service; see the download options on this page for current pricing.

Does Williamson County, TX have an official GIS or property records website?

Yes — the official Williamson County, TX government website is linked in the county details above. Land Records standardizes Williamson County, TX assessor and recorder records into a single nationwide parcel schema with GIS boundary geometry.

On this page

Attribute coverageSchema mappingNeighboring countiesFAQRelated