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Rock County, WI Parcels & GIS Data

Rock County, WI parcel data: 72,175 property records with owner names, assessed values, land use, acreage, and addresses. Preview and download.

Land Records publishes Rock County, Wisconsin parcel data covering 72,175 property records.

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

Rock County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 163,687. Its county seat is Janesville.

FIPS 55105

Official county website: https://rockcountylio.maps.arcgis.com/

The FIPS code for Rock County is 55105.

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Attribute coverage

Rock County contains 72,175 parcels in the current dataset. Column coverage is the percentage of those parcels for which the attribute is populated (non-NULL).

ColumnCoverageRecords populated
lrid100%72,175
parcelid100%72,175
parcelid2100%72,174
ogparcelid100%72,175
ogparcelid2100%72,174
parentid<0.1%0
stackid<0.1%0
geoid100%72,175
statefp100%72,175
countyfp100%72,175
countyname100%72,175
cousubfp100%72,175
cousubname100%72,175
tractce100%72,175
tractname100%72,175
taxacctnum84.9%61,288
taxyear100%72,175
taxdistrict100%72,163
usecode95.9%69,230
usedesc0.1%53
zoningcode<0.1%0
zoningdesc<0.1%0
numbldgs84.8%61,183
numunits84.7%61,123
yearbuilt<0.1%0
numfloors<0.1%0
bldgsqft<0.1%0
bedrooms<0.1%0
halfbaths<0.1%0
fullbaths<0.1%0
imprvalue99.9%72,107
landvalue100%72,168
agvalue<0.1%0
totalvalue100%72,168
taxacres100%72,171
calcarea100%72,175
saleamt<0.1%0
saledate<0.1%0
ownertype0.1%88
ownername100%72,162
owneraddr100%72,161
ownercity<0.1%0
ownerstate<0.1%0
ownerzip<0.1%0
parceladdr88.8%64,106
parcelcity100%72,162
parcelstate100%72,175
parcelzip100%72,175
legaldesc<0.1%0
township100%72,151
section100%72,151
qtrsection100%72,151
range100%72,151
plssdesc100%72,151
book<0.1%0
page<0.1%0
block<0.1%0
lot<0.1%0
parceltype0.5%338
accesstype0.6%461
iucnclass0.3%203
placename68.1%49,162
placetype4.8%3,469
firmid100%72,175
firmdate100%72,175
fldzone100%72,175
zonesubty98.3%70,974
staticbfe<0.1%5
elevmin98.6%71,162
elevmax98.6%71,162
elevavg98.6%71,162
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
naicscode0.1%41
frsid<0.1%0
dfrurl<0.1%0
caapermit<0.1%0
cwapermit<0.1%0
rcrapermit<0.1%0
updated100%72,175
centroidx100%72,175
centroidy100%72,175
surfpointx100%72,175
surfpointy100%72,175
geom100%72,175
extras100%72,175
ownerlist0.1%87
placefp66.8%48,190
zoningurl<0.1%0

Schema mapping

How source columns from the acquired Rock 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 — Rock County, Wisconsin (55105) 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 taxparceli parcelid taxrollyea propclass impvalue lndvalue cntassdval assdacres ownernme1 ownernme2 pstladress siteadress placename state zipcode loaddate geom schooldist id stateid parceldate addnumpref addnum addnumsuff prefix streetname streettype suffix landmarkna unittype unitid zip4 schooldi_1 mflvalue estfmkvalu netprpta grsprpta auxclass deedacres gisacres coname parcelfips parcelsrc longitude latitude parcelid parcelid2 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 98.6% elevmin 98.6% elevmax 98.6% elevavg s_fld_haz_ar · FEMA NFHL 100% fldzone 98.3% zonesubty 0.0% staticbfe 100% firmdate 100% firmid supplemented · derived / other pipelines 84.9% taxacctnum 84.8% numbldgs 84.7% numunits 100% township 100% section 100% qtrsection 100% range 100% plssdesc 68.1% placename 66.8% placefp lrid parcelid parcelid2 ogparcelid ogparcelid2 geoid statefp countyfp countyname cousubfp cousubname tractce tractname taxacctnum taxyear taxdistrict usecode numbldgs numunits imprvalue landvalue totalvalue taxacres calcarea ownertype ownername owneraddr parceladdr parcelcity parcelstate parcelzip township section qtrsection range plssdesc placename firmid firmdate fldzone zonesubty staticbfe elevmin elevmax elevavg updated centroidx centroidy surfpointx surfpointy geom extras placefp publish.parcel_layer columns not fed by these sources (42) — empty or below 50% fill in this county parentid, stackid, usedesc, zoningcode, zoningdesc, yearbuilt, numfloors, bldgsqft, bedrooms, halfbaths, fullbaths, agvalue, saleamt, saledate ownercity, ownerstate, ownerzip, legaldesc, book, page, block, lot, parceltype, accesstype, iucnclass, placetype, fireplaces, heating, heatfuel cooling, foundation, roofcover, siding, bldgtype, naicscode, frsid, dfrurl, caapermit, cwapermit, rcrapermit, ownerlist, zoningurl PARCEL 18 mapped · 2 transformed · 37 unmapped (NULL) SOURCE COLUMNS HARMONIZED → PARCEL taxparceli parcelid taxrollyea propclass impvalue lndvalue cntassdval assdacres ownernme1 ownernme2 pstladress siteadress placename state zipcode loaddate geom schooldist id stateid parceldate addnumpref addnum addnumsuff prefix streetname streettype suffix landmarkna unittype unitid zip4 schooldi_1 mflvalue estfmkvalu netprpta grsprpta auxclass deedacres gisacres coname parcelfips parcelsrc longitude latitude parcelid parcelid2 taxyear usecode imprvalue landvalue totalvalue taxacres ownername NULLIF(concat_ws(';', NULLIF(trim(ownernme1), ''), NULLIF(trim(… owneraddr parceladdr parcelcity parcelstate parcelzip updated geom taxdistrict extras ( json_build_object( 'id', id::text, 'stateid', stateid::text, … not present in source — filled with NULL (37) taxacctnum, 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 Rock County:

Frequently asked questions

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

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

How many parcels are in Rock County, WI?

The current dataset contains 72,175 parcel records for Rock County, WI, each with its boundary geometry and assessor attributes.

What is the FIPS code for Rock County, WI?

The FIPS code for Rock County, WI is 55105.

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

Each Rock 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 Rock County, WI parcel data free?

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

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

On this page

Attribute coverageSchema mappingNeighboring countiesFAQRelated