Cook County
Parcel & Property Data
About This Data
LandBrief holds 12,679 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 August 2025, loaded August 2026. See data sources for every county’s vintage.
Explore Cook County
Cook County by the Numbers
- Median parcel size
- 5.8 acres
measured from mapped boundaries - 90th-percentile parcel
- 352.9 acres
- County land area
- 929,648 acres
U.S. Census measurement - Communities
- 7
73.2% of parcels outside any incorporated place
Who Owns Cook County?
Share of the county’s 12,679 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 | 51.9% |
| Companies & organizations | 8.9% |
| Trusts & estates | 13.4% |
| Government | 21.4% |
| Other / unclassified | 4.4% |
The largest owner on record is UNITED STATES OF AMERICA with 809 parcels — see the full landowner leaderboard.
Parcel Records (~12,679 total)
| Parcel ID | Owner | Address | City | Acreage |
|---|---|---|---|---|
| 55-227-1200 | STATE OF MN - PARK | 4051 E HWY 61 | Unincorporated | 4500.00 |
| 20-238-0101 | ALLETE INC | — | Unincorporated | 984.70 |
| 53-229-1100 | USFS (SUPERIOR NATL FOREST) | — | Unincorporated | 747.15 |
| 48-331-1100 | USA - BWCA | — | Unincorporated | 731.20 |
| 48-306-1100 | USA - BWCA | — | Unincorporated | 726.25 |
| 51-520-1100 | USA - BWCA | — | Unincorporated | 717.50 |
| 48-330-1100 | USA - BWCA | — | Unincorporated | 716.86 |
| 48-319-1100 | USA - BWCA | — | Unincorporated | 709.28 |
| 48-318-1100 | USA - BWCA | — | Unincorporated | 704.80 |
| 55-316-0000 | STATE OF MINNESOTA | 65 BRUMBAUGH RD | Unincorporated | 700.00 |
Download Cook County parcel data
All 12,679 parcels in Cook County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.
Get Cook County on FreeParcelData →Nearby counties
Frequently Asked Questions
How many parcels are in Cook County?
The Cook County assessor roll on file records 12,679 parcels across 7 communities, with 73.2% lying outside any incorporated place.
Who owns the most land in Cook County?
UNITED STATES OF AMERICA holds 809 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 5.8 acres, and nine parcels in ten are under 352.9 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.
How much of Cook County is government-owned?
Government entities — federal, state, and local — hold 21.4% 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 August 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 (7)
12,679 parcels across 7 communities in Cook County.