Winnebago County

Parcel & Property Data

125,494Total Parcels

—Avg. Market Value

338,793Total Acres (measured from parcel boundaries)

About This Data

LandBrief holds 125,494 parcel records for Winnebago County, sourced from county records. Each includes the parcel boundary, and — where the county publishes them — owner, situs address, acreage, assessed values and legal description.

Data from the Winnebago County assessor roll dated July 2025, loaded August 2026. See data sources for every county’s vintage.

Explore Winnebago County

Winnebago County by the Numbers

Median parcel size: 0.30 acres
measured from mapped boundaries
90th-percentile parcel: 3.5 acres
County land area: 328,352 acres
U.S. Census measurement
Communities: 24
4.3% of parcels outside any incorporated place
Out-of-state owners: 4.0% of parcels
by owner mailing address

Who Owns Winnebago County?

Share of the county’s 125,494 parcels by the kind of owner on record. Classified from owner names, so the boundaries are approximate; an entity the rules cannot place counts as an individual.

Owner type	Share of parcels
Individuals	85.0%
Companies & organizations	11.5%
Trusts & estates	1.1%
Government	1.9%
Other / unclassified	0.6%

The largest owner on record is CITY OF ROCKFORD with 504 parcels — see the full landowner leaderboard.

Parcel Records (~125,494 total)

Showper page

Parcel ID	Owner	Address	City	Acreage
1001300001	MCDOUGALL FARMS LLC	7529 N HARRISON RD	Rockford	104.99 †
1031400004	WESTPHAL SHAWN	2539 N KEITH RD	Winnebago	5.84 †
1031400005	SIEVERT DEVON A & DANA A	2625 N KEITH RD	Winnebago	2.34 †
1031200005	DIGVONNI LARRY A & CINDERELLA J	3217 N KEITH RD	Winnebago	41.41 †
1030400006	LOESCHER JASON J & RITTNER CHRISTINA T	3721 N KEITH RD	Pecatonica	11.73 †
1031200004	DIGVONNI FRANK J & GAIL A	N KEITH RD	Unincorporated	35.69 †
1036200004	OLLIE O LAND LLC	2782 N MERIDIAN RD	Rockford	11.96 †
1025400007	HOLM ANDREW & CHRISTINA	3350 N MERIDIAN RD	Rockford	3.81 †
1025400006	SPATARO BECKY	3458 N MERIDIAN RD	Rockford	2.50 †
1025400005	PEREZ FIDENCIO & MARIA	3510 N MERIDIAN RD	Rockford	2.50 †

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All 125,494 parcels in Winnebago County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

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Frequently Asked Questions

How many parcels are in Winnebago County?

The Winnebago County assessor roll on file records 125,494 parcels across 24 communities, with 4.3% lying outside any incorporated place.

Who owns the most land in Winnebago County?

CITY OF ROCKFORD holds 504 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Winnebago County?

Measured from mapped boundaries, the median parcel is 0.30 acres, and nine parcels in ten are under 3.5 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Winnebago County is owned from out of state?

4.0% of parcels list an owner mailing address outside IL, per the county’s own records.

How much of Winnebago County is government-owned?

Government entities — federal, state, and local — hold 1.9% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Winnebago County assessor roll dated July 2025. Counties deliver on their own schedules; the methodology page explains how records are processed and the data sources page tracks every county’s vintage.