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Rock County, Wisconsin property search

Search an address or an owner in Rock County, Wisconsin with the box at the top of the map, or tap a lot, for its owner, lines and acreage. 72,770 lots are mapped here, covering 470,390 acres. 11,301 of them are held by institutions rather than by individuals.

Farmers and landowners in Rock County received $19.1 million in federal farm program payments in 2025, paid to 1,126 recipients. 6,269 acres of agricultural land here are disclosed as foreign-held, the most by owners from United Kingdom. Crop insurance paid $3.8 million in claims for the 2024 crop year.

72,770
Lots mapped
470,390
Acres
11,301
Institutional

Land use in Rock County

Parcels and acreage by land use in Rock County, Wisconsin
Land useParcelsAcres
159,56048,351
22,1905,733
4,51,888112,635
41,10224,799
4,5,776858,089
1,47288,504
4,5,5M62044,932
1,4,543719,916
4,5,5M,735634,400
4,73067,481
4,5M2218,385
1,4,5,5M21611,402

Largest landowners in Rock County

Largest landowners by acreage in Rock County, Wisconsin
OwnerParcelsAcres
STATE OF WISCONSIN966,055
STATE OF WISCONSIN DNR333,408
CITY OF JANESVILLE4193,408
ROGER REBOUT & SONS FARMS413,402
COUNTY OF ROCK1303,215
SAYRE JOINT FARMS LLC442,907
ATKINSON FARMS INC302,775
LARSON ACRES INC342,738
TOM & DONNA SAYRE FARMS LLC332,535
TRACY & SON FARMS INC292,420

Companies, trusts and public agencies, ranked by acres held under the name on the assessor's file. Private individuals are not ranked. Largest landowners in Wisconsin

Federal farm payments in Rock County

$19.1M
Paid in 2025
1,126
Recipients
Federal farm program payments by program in Rock County, Wisconsin, 2025
ProgramPaid
Emergency Commodity Assistance Program$9.5M
Supplemental Disaster Relief Non-Spec Crops$6.4M
CRP Payment - Annual Rental$1.3M
Agricultural Risk Coverage Program - County$1.2M
Marketing Assistance for Specialty Crops$410K
Supplemental Disaster Relief Spec Crops$120K

USDA Farm Service Agency payment files, 2025. Compare farm subsidies by county

Foreign-held farmland in Rock County

6,269
Acres disclosed
35
Holdings
Foreign-held agricultural land by country in Rock County, Wisconsin, 2024
CountryAcres
United Kingdom2,811
Germany1,813
Canada804
Portugal551
Croatia160
Mexico129

Largest disclosed holders

Largest foreign holders of agricultural land in Rock County, Wisconsin
Holder (country)Acres
SUNRISE SOLAR, LLC (UNITED KINGDOM)1,410
Geronimo Solar Energy, LLC (UNITED KINGDOM)948
B.D.M. FARMS, INC. (GERMANY)811
EDP Renewables North America LLC (formerly Horizon Wind Energy LLC) (PORTUGAL)551
DARIEN SOLAR ENERGY CENTER, LLC (CANADA)524

USDA Agricultural Foreign Investment Disclosure Act filings, holdings at the end of 2024. Only disclosed interests are counted. See foreign-owned farmland by county

Crop insurance in Rock County

1,147
Policies
223,393
Insured acres
$3.8M
Claims paid
0.38
Loss ratio
Crop insurance claims by crop in Rock County, Wisconsin, 2024
CropClaims
Corn$2M
Soybeans$1.6M
All Other Crops$127K
Green Peas$106K
Forage Seeding$23K

USDA Risk Management Agency Summary of Business, 2024 crop year.

Conservation and the power grid

7,151
CRP acres, 2025
78
Substations
2
345 kV and up
345 kV
Highest voltage

Conservation Reserve Program acres under contract (USDA FSA). Substations in service, from a public copy of the federal HIFLD layer.

Find out who owns a property in Rock County by address, free, or work out a lot's acreage.

Nearby counties in Wisconsin

  • Green County28,058
  • Walworth County69,062
  • Jefferson County44,881
  • Dane County218,093
  • Waukesha County163,493
  • Kenosha County68,366
  • Racine County84,282
  • Lafayette County21,547

All Wisconsin counties

Rock County last published these records on June 22, 2025. Assessment records, not a survey.