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Grant County, WI Parcels & GIS Data

Grant County, WI parcel data: 48,765 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes Grant County, Wisconsin parcel data covering 48,765 property records.

This page documents parcel-level coverage for Grant County, Wisconsin. 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 Grant County are listed in the attribute-coverage table below. Preview the data in the interactive explorer, or download the complete Grant County property dataset.

Grant County is the most southwestern county in the U.S. state of Wisconsin. As of the 2020 census, the population was 51,938. Its county seat is Lancaster and its largest city is Platteville.

FIPS 55043

Official county website: http://www.co.grant.wi.gov

The FIPS code for Grant County is 55043.

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Attribute coverage

Grant County contains 48,765 parcels in the current dataset. Column coverage is the percentage of those parcels for which the attribute is populated (non-NULL).

ColumnCoverageRecords populated
lrid100%48,765
parcelid100%48,759
parcelid2100%48,765
ogparcelid100%48,759
ogparcelid2100%48,765
parentid<0.1%0
stackid<0.1%0
geoid100%48,765
statefp100%48,765
countyfp100%48,765
countyname100%48,765
cousubfp100%48,765
cousubname100%48,765
tractce100%48,765
tractname100%48,765
taxacctnum100%48,765
taxyear100%48,765
taxdistrict99.8%48,669
usecode93.0%45,340
usedesc<0.1%0
zoningcode<0.1%0
zoningdesc<0.1%0
numbldgs45.9%22,388
numunits45.9%22,388
yearbuilt<0.1%0
numfloors<0.1%0
bldgsqft<0.1%0
bedrooms<0.1%0
halfbaths<0.1%0
fullbaths<0.1%0
imprvalue100%48,765
landvalue100%48,765
agvalue<0.1%0
totalvalue100%48,765
taxacres100%48,765
calcarea100%48,765
saleamt<0.1%0
saledate<0.1%0
ownertype99.8%48,669
ownername99.8%48,669
owneraddr99.8%48,669
ownercity<0.1%0
ownerstate<0.1%0
ownerzip<0.1%0
parceladdr46.1%22,458
parcelcity99.8%48,668
parcelstate100%48,765
parcelzip100%48,765
legaldesc<0.1%0
township99.9%48,726
section99.9%48,726
qtrsection99.9%48,726
range99.9%48,726
plssdesc99.9%48,726
book<0.1%0
page<0.1%0
block<0.1%0
lot<0.1%0
parceltype0.4%184
accesstype0.9%421
iucnclass0.5%253
placename33.0%16,098
placetype3.6%1,733
firmid99.9%48,716
firmdate99.9%48,716
fldzone99.9%48,716
zonesubty96.8%47,188
staticbfe<0.1%17
elevmin99.8%48,682
elevmax99.8%48,682
elevavg99.8%48,682
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
naicscode45.8%22,341
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated100%48,765
centroidx100%48,765
centroidy100%48,765
surfpointx100%48,765
surfpointy100%48,765
geom100%48,765
extras100%48,765
ownerlist66.6%32,473
placefp31.6%15,411
zoningurl<0.1%0

Schema mapping

How source columns from the acquired Grant 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 — Grant County, Wisconsin (55043) 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 PARCEL parcelid stateid taxparceli taxrollyea propclass impvalue lndvalue cntassdval assdacres ownernme1 ownernme2 pstladress siteadress placename state zipcode loaddate geom schooldist 24 cols ⇢ parcelid parcelid2 taxacctnum taxyear usecode imprvalue landvalue totalvalue taxacres ownername owneraddr parceladdr parcelcity parcelstate parcelzip updated geom taxdistrict 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 100% elevmin 100% elevmax 100% elevavg s_fld_haz_ar · FEMA NFHL 100% fldzone 96.8% zonesubty 0.0% staticbfe 100% firmdate 100% firmid supplemented · derived / other pipelines 100% township 100% section 100% qtrsection 100% range 100% plssdesc 66.6% ownerlist lrid parcelid parcelid2 ogparcelid ogparcelid2 geoid statefp countyfp countyname cousubfp cousubname tractce tractname taxacctnum taxyear taxdistrict usecode imprvalue landvalue totalvalue taxacres calcarea ownertype ownername owneraddr parceladdr parcelcity parcelstate parcelzip township section qtrsection range plssdesc firmid firmdate fldzone zonesubty staticbfe elevmin elevmax elevavg updated centroidx centroidy surfpointx surfpointy geom extras ownerlist publish.parcel_layer columns not fed by these sources (45) — empty or below 50% fill in this county parentid, stackid, usedesc, zoningcode, zoningdesc, numbldgs, numunits, yearbuilt, numfloors, bldgsqft, bedrooms, halfbaths, fullbaths, agvalue saleamt, saledate, ownercity, ownerstate, ownerzip, legaldesc, book, page, block, lot, parceltype, accesstype, iucnclass, placename, placetype fireplaces, heating, heatfuel, cooling, foundation, roofcover, siding, bldgtype, naicscode, frsid, dfrurl, caapermit, cwapermit, rcrapermit placefp, zoningurl PARCEL 18 mapped · 1 transformed · 24 kept in extras · 36 unmapped (NULL) SOURCE COLUMNS HARMONIZED → PARCEL parcelid stateid taxparceli taxrollyea propclass impvalue lndvalue cntassdval assdacres ownernme1 ownernme2 pstladress siteadress placename state zipcode loaddate geom schooldist parcelid parcelid2 taxacctnum taxyear usecode imprvalue landvalue totalvalue taxacres ownername CASE WHEN ownernme1 IS NULL AND ownernme2 IS NULL THEN NULL WHE… owneraddr parceladdr parcelcity parcelstate parcelzip updated geom taxdistrict extras · 24 source columns preserved as json id, parceldate, addnumpref, addnum, prefix, streetname streettype, suffix, unittype, unitid, zip4, schooldi_1 mflvalue, estfmkvalu, netprpta, grsprpta, auxclass, deedacres gisacres, coname, parcelfips, parcelsrc, longitude, latitude extras not present in source — filled with NULL (36) usedesc, zoningcode, zoningdesc, numbldgs, numunits, yearbuilt, numfloors, bldgsqft, bedrooms, halfbaths, fullbaths, agvalue, saleamt, saledate ownercity, ownerstate, ownerzip, legaldesc, township, section, qtrsection, range, plssdesc, book, page, block, lot, sourceurl, parentid heatfuel, fireplaces, heating, cooling, foundation, roofcover, siding

Neighboring counties

Parcel data for counties bordering Grant County:

Frequently asked questions

Where can I find Grant County, WI parcel and GIS data?

Land Records publishes a Grant County, WI 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 Grant County, WI dataset as a GeoPackage or CSV.

How many parcels are in Grant County, WI?

The current dataset contains 48,765 parcel records for Grant County, WI, each with its boundary geometry and assessor attributes.

What is the FIPS code for Grant County, WI?

The FIPS code for Grant County, WI is 55043.

What information does each Grant County, WI parcel record include?

Each Grant County, WI 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 Grant County, WI parcel data free?

You can preview Grant County, WI 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 Grant County, WI have an official GIS or property records website?

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

On this page

Attribute coverageSchema mappingNeighboring countiesFAQRelated