LandBrief

DuPage County

Parcel & Property Data

336,738Total Parcels
—Avg. Market Value
693,953Total Acres (measured from parcel boundaries)

About This Data

LandBrief holds 336,738 parcel records for DuPage 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 DuPage County assessor roll dated July 2025, loaded August 2026. See data sources for every county’s vintage.

Explore DuPage County

DuPage County by the Numbers

Median parcel size
0.25 acres
measured from mapped boundaries
90th-percentile parcel
4.6 acres
County land area
209,822 acres
U.S. Census measurement
Communities
44
2.3% of parcels outside any incorporated place
Out-of-state owners
2.2% of parcels
by owner mailing address

Who Owns DuPage County?

Share of the county’s 336,738 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
Individuals90.4%
Companies & organizations6.2%
Trusts & estates1.4%
Government1.6%
Other / unclassified0.4%

The largest owner on record is FOREST PRESERVE DISTRICT with 970 parcels — see the full landowner leaderboard.

Parcel Records (~336,738 total)

per page
Parcel IDOwnerAddressCityAcreage
1016100018FOREST PRESERVE DISTRICTWATERFALL GLENUnincorporated954.34 †
1009100002UNITED STATES OF AMERICAARGONNE NATL LABUnincorporated644.06 †
0419100001UNITED STATES OF AMERICA—Unincorporated631.52 †
0420100001UNITED STATES OF AMERICAMCCHESNEY & WILSUnincorporated628.84 †
1003400008FOREST PRESERVE DISTRICTWATERFALL GLENUnincorporated499.63 †
1010100002UNITED STATES OF AMERICAARGONNE NATL LABUnincorporated335.98 †
1004300005FOREST PRESERVE DISTRICTWATERFALL GLENUnincorporated321.57 †
0417300002UNITED STATES OF AMERICAMCCHESNEY & WILSUnincorporated307.01 †
0406300016DU PAGE AIRPORT AUTHORITYKAUTZ RDWest Chicago293.11 †
0106400007DUPAGE CO FOREST PRESERVESTEARNS RDBartlett286.44 †
Page 1 of 33674

Download DuPage County parcel data

All 336,738 parcels in DuPage County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

Get DuPage County on FreeParcelData →

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Frequently Asked Questions

How many parcels are in DuPage County?

The DuPage County assessor roll on file records 336,738 parcels across 44 communities, with 2.3% lying outside any incorporated place.

Who owns the most land in DuPage County?

FOREST PRESERVE DISTRICT holds 970 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in DuPage County?

Measured from mapped boundaries, the median parcel is 0.25 acres, and nine parcels in ten are under 4.6 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

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

2.2% of parcels list an owner mailing address outside IL, per the county’s own records.

How much of DuPage County is government-owned?

Government entities — federal, state, and local — hold 1.6% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the DuPage 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 (44)

336,738 parcels across 44 communities in DuPage County.