LandBrief

Cook County

Parcel & Property Data

1,393,891Total Parcels
—Avg. Market Value
468,173Total Acres (measured from parcel boundaries)

About This Data

LandBrief holds 1,393,891 parcel records for Cook 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 Cook County assessor roll dated July 2025, loaded August 2026. See data sources for every county’s vintage.

Explore Cook County

Cook County by the Numbers

Median parcel size
0.12 acres
measured from mapped boundaries
90th-percentile parcel
0.32 acres
County land area
604,751 acres
U.S. Census measurement
Communities
138
0.4% of parcels outside any incorporated place
Out-of-state owners
3.1% of parcels
by owner mailing address

Who Owns Cook County?

Share of the county’s 1,393,891 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 typeShare of parcels
Individuals84.5%
Companies & organizations6.9%
Trusts & estates1.8%
Government0.1%
Other / unclassified6.7%

The largest owner on record is OF TAXPAYER with 10,752 parcels — see the full landowner leaderboard.

Parcel Records (~1,393,891 total)

per page
Parcel IDOwnerAddressCityAcreage
01-25-203-052-0000DEVELP DEARBORN CONST1708 E ALGONQUIN RD, HOFFMAN ESTATES, IL 00000Hoffman Estates0.31 †
01-25-100-053-0000—67 E ALGONQUIN RD, BARRINGTON, IL 60010Barrington3.78 †
01-25-100-054-0000—67 E ALGONQUIN RD, BARRINGTON, IL 60010Barrington0.01 †
01-25-100-055-0000—67 E ALGONQUIN RD, BARRINGTON, IL 60010Barrington13.19 †
01-25-100-056-0000—67 E ALGONQUIN RD, BARRINGTON, IL 60010Barrington8.53 †
01-25-100-057-0000—67 E ALGONQUIN RD, BARRINGTON, IL 60010Barrington5.53 †
01-25-100-058-0000—67 E ALGONQUIN RD, BARRINGTON, IL 60010Barrington9.10 †
01-25-100-059-0000—67 E ALGONQUIN RD, BARRINGTON, IL 60010Barrington0.11 †
01-25-100-060-0000—67 E ALGONQUIN RD, BARRINGTON, IL 60010Barrington3.46 †
01-25-100-061-0000—67 E ALGONQUIN RD, BARRINGTON, IL 60010Barrington0.89 †
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Download Cook County parcel data

All 1,393,891 parcels in Cook County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

Get Cook County on FreeParcelData →

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Frequently Asked Questions

How many parcels are in Cook County?

The Cook County assessor roll on file records 1,393,891 parcels across 138 communities, with 0.4% lying outside any incorporated place.

Who owns the most land in Cook County?

OF TAXPAYER holds 10,752 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Cook County?

Measured from mapped boundaries, the median parcel is 0.12 acres, and nine parcels in ten are under 0.32 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

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

3.1% of parcels list an owner mailing address outside IL, per the county’s own records.

How much of Cook County is government-owned?

Government entities — federal, state, and local — hold 0.1% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Cook 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.

Browse by City (138)

1,393,891 parcels across 138 communities in Cook County.