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Williamson County, TX Parcels & GIS Data

Williamson County, TX parcel data: 290,868 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes Williamson County, Texas parcel data covering 290,868 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: https://gis.wilco.org/maps/?viewer=countymap

The FIPS code for Williamson County is 48491.

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Attribute coverage

Williamson County contains 290,868 parcels in the current dataset. Column coverage is the percentage of those parcels for which the attribute is populated (non-NULL). For the LBCS columns, only real classifications count: the to-be-determined and not-applicable placeholder codes are excluded.

ColumnCoverageRecords populated
lrid100%290,868
parcelid100%290,753
parcelid2100%290,839
ogparcelid100%290,753
ogparcelid2100%290,838
parentid<0.1%0
stackid<0.1%0
geoid100%290,868
statefp100%290,868
countyfp100%290,868
countyname100%290,868
cousubfp100%290,868
cousubname100%290,868
tractce100%290,868
tractname100%290,868
taxacctnum100%290,752
taxyear<0.1%0
taxdistrict99.9%290,714
usecode100%290,752
usedesc100%290,752
zoningcode36.3%105,603
zoningdesc57.6%167,491
numbldgs89.8%261,136
numunits1.4%4,123
yearbuilt<0.1%0
numfloors1.4%4,123
bldgsqft<0.1%0
bedrooms<0.1%0
halfbaths<0.1%0
fullbaths<0.1%0
imprvalue<0.1%0
landvalue100%290,803
agvalue<0.1%0
totalvalue100%290,803
taxacres34.7%100,898
calcarea100%290,868
saleamt<0.1%0
saledate<0.1%0
ownertype100%290,745
ownername100%290,745
owneraddr99.9%290,551
ownercity99.9%290,574
ownerstate99.8%290,379
ownerzip99.8%290,359
parceladdr100%290,763
parcelcity99.9%290,644
parcelstate100%290,868
parcelzip100%290,868
legaldesc99.8%290,251
township<0.1%0
section<0.1%0
qtrsection<0.1%0
range<0.1%0
plssdesc<0.1%0
book3.8%10,943
page3.8%10,939
block<0.1%7
lot84.9%246,856
parceltype0.2%648
accesstype0.7%1,965
iucnclass0.1%236
placename3.5%10,215
placetype3.5%10,085
firmid100%290,751
firmdate100%290,751
fldzone100%290,751
zonesubty98.8%287,260
staticbfe<0.1%116
elevmin77.6%225,823
elevmax77.6%225,823
elevavg77.6%225,823
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
naicscode8.9%25,782
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated100%290,868
centroidx100%290,868
centroidy100%290,868
surfpointx100%290,868
surfpointy100%290,868
geom100%290,868
extras100%290,868
ownerlist76.1%221,479
placefp67.6%196,581
zoningurl36.3%105,489
lbcsactivity87.3%253,958
lbcsfunction86.7%252,150
lbcstype95.8%278,694
lbcscharacter89.3%259,883
lbcsownership100%290,746
sourceurl98.4%286,083

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) 3 entities · most recent acquisition per entity · generated 2026-10-17 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 ADDRESS address address_fraction prefix_direction prefix_type street_name street_type suffix_direction address_suffix geom address_type parent_place_id place_id segment_id full_street_name created_by created_date modified_by modified_date house_number road unit geom extras PARCEL parcelid camaid propertyid usecd usedscrp resyrblt floorcount bldgarea lndvalue cntassdval assessedac ownernme1 ownernme2 pstladdress pstlcity pstlstate pstlzip5 siteaddress abstract book page lastupdate geom lowparcelid building unit statedarea lglstartdt cvttxdscrp nghbrhdcd classcd classdscrp prprtydscrp cnvyname pstlzip4 resflrarea resstrtyp strclass classmod prvassdval assdvalyrcg assdpcntcg prvtxblval cnttxblval txblvalyrchg txblpcntchg prvwnttxod prvsmrtxod totprvtxtod cntwnttxod cntsmrtxod totcnttxod txodyrchg txodpcntchg waterserv sewerserv statedac type cvttxcd schltxcd schldscrp globalid totacredeed instrumentnumber mapnumber parcelid parcelid2 taxacctnum usecode usedesc yearbuilt numfloors bldgsqft landvalue totalvalue taxacres ownername owneraddr ownercity ownerstate ownerzip parceladdr legaldesc book page updated geom extras ZONING zoningabbrev zoningdescription zoningtype ordinancenumber description geom 11 cols ⇢ zoningcode zoningdesc zoningtype ordinance notes geom extras determined · ground truth 100% lrid 100% geoid 100% statefp 100% countyfp 100% countyname 100% cousubfp 100% cousubname 100% tractce 100% tractname geom · derived from geometry geom dem.us_1m · USGS 1m DEM 77.6% elevmin 77.6% elevmax 77.6% elevavg s_fld_haz_ar · FEMA NFHL 100% fldzone 98.8% zonesubty 0.0% staticbfe 100% firmdate 100% firmid supplemented · derived / other pipelines 100% taxdistrict 89.8% numbldgs 100% parcelcity 100% parcelstate 100% parcelzip 84.9% lot 76.1% ownerlist 67.6% placefp 87.3% lbcsactivity 86.7% lbcsfunction 95.8% lbcstype 89.3% lbcscharacter 100% lbcsownership 98.4% sourceurl lrid parcelid parcelid2 ogparcelid ogparcelid2 geoid statefp countyfp countyname cousubfp cousubname tractce tractname taxacctnum taxdistrict usecode usedesc zoningcode zoningdesc numbldgs yearbuilt numfloors bldgsqft landvalue totalvalue taxacres calcarea ownertype ownername owneraddr ownercity ownerstate ownerzip parceladdr parcelcity parcelstate parcelzip legaldesc book page lot firmid firmdate fldzone zonesubty staticbfe elevmin elevmax elevavg updated centroidx centroidy surfpointx surfpointy geom extras ownerlist placefp lbcsactivity lbcsfunction lbcstype lbcscharacter lbcsownership sourceurl publish.parcel_layer columns not fed by these sources (37) — empty or below 50% fill in this county parentid, stackid, taxyear, numunits, bedrooms, halfbaths, fullbaths, imprvalue, agvalue, saleamt, saledate, township, section, qtrsection range, plssdesc, block, parceltype, accesstype, iucnclass, placename, placetype, fireplaces, heating, heatfuel, cooling, foundation, roofcover siding, bldgtype, naicscode, frsid, dfrurl, caapermit, cwapermit, rcrapermit, zoningurl ADDRESS 5 mapped · 4 transformed · 17 unmapped (NULL) SOURCE COLUMNS HARMONIZED → ADDRESS address address_fraction prefix_direction prefix_type street_name street_type suffix_direction address_suffix geom address_type parent_place_id place_id segment_id full_street_name created_by created_date modified_by modified_date house_number nullif(concat_ws(' ', address::text, nullif(trim(address_fracti… road nullif(concat_ws(' ', nullif(trim(prefix_direction::text), ''),… unit nullif(trim(address_suffix::text), '')::text geom extras json_build_object( 'address_type', address_type::text, 'parent_… not present in source — filled with NULL (17) house, category, near, level, staircase, entrance, po_box, postcode, suburb, city_district, city, island, state_district, state, country_region country, world_region PARCEL 23 mapped · 3 transformed · 32 unmapped (NULL) SOURCE COLUMNS HARMONIZED → PARCEL parcelid camaid propertyid usecd usedscrp resyrblt floorcount bldgarea lndvalue cntassdval assessedac ownernme1 ownernme2 pstladdress pstlcity pstlstate pstlzip5 siteaddress abstract book page lastupdate geom lowparcelid building unit statedarea lglstartdt cvttxdscrp nghbrhdcd classcd classdscrp prprtydscrp cnvyname pstlzip4 resflrarea resstrtyp strclass classmod prvassdval assdvalyrcg assdpcntcg prvtxblval cnttxblval txblvalyrchg txblpcntchg prvwnttxod prvsmrtxod totprvtxtod cntwnttxod cntsmrtxod totcnttxod txodyrchg txodpcntchg waterserv sewerserv statedac type cvttxcd schltxcd schldscrp globalid totacredeed instrumentnumber mapnumber parcelid parcelid2 taxacctnum usecode usedesc yearbuilt numfloors bldgsqft landvalue totalvalue taxacres ownername CASE WHEN ownernme1 IS NULL AND ownernme2 IS NULL THEN NULL::te… owneraddr ownercity ownerstate ownerzip parceladdr legaldesc book page updated to_char(to_timestamp(lastupdate / 1000.0), 'YYYY-MM-DD')::text geom extras ( json_build_object( 'lowparcelid', lowparcelid::text, 'buildin… not present in source — filled with NULL (32) taxyear, zoningcode, zoningdesc, numbldgs, numunits, bedrooms, halfbaths, fullbaths, imprvalue, agvalue, saleamt, saledate, parcelcity parcelstate, parcelzip, township, section, qtrsection, range, plssdesc, block, lot, sourceurl, taxdistrict, parentid, heatfuel, fireplaces heating, cooling, foundation, roofcover, siding ZONING 6 mapped · 11 kept in extras · 3 unmapped (NULL) SOURCE COLUMNS HARMONIZED → ZONING zoningabbrev zoningdescription zoningtype ordinancenumber description geom zoningcode zoningdesc zoningtype ordinance notes geom extras · 11 source columns preserved as json zoningid, zoningplanid, basezoningid, name, legaldate cond_use, globalid, created_user, created_date last_edited_user, last_edited_date extras 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 290,868 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