St. Clair County

Parcel & Property Data

148,902Total Parcels

—Avg. Market Value

408,984Total Acres

About This Data

LandBrief holds 148,902 parcel records for St. Clair 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 St. Clair County assessor roll dated July 2025, loaded August 2026. See data sources for every county’s vintage.

Explore St. Clair County

St. Clair County by the Numbers

Median parcel size: 0.24 acres
measured from mapped boundaries
90th-percentile parcel: 3.7 acres
County land area: 420,959 acres
U.S. Census measurement
Communities: 46
5.8% of parcels outside any incorporated place
Out-of-state owners: 8.1% of parcels
by owner mailing address

Who Owns St. Clair County?

Share of the county’s 148,902 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	75.9%
Companies & organizations	13.7%
Trusts & estates	5.1%
Government	4.4%
Other / unclassified	0.9%

The largest owner on record is ST CLAIR CO TRUSTEE with 2,221 parcels — see the full landowner leaderboard.

Parcel Records (~148,902 total)

Showper page

Parcel ID	Owner	Address	City	Acreage
14-22.0-100-007	COAST TO COAST BUSINESS EQUIP	MINE HAUL RD	Unincorporated	1209.04
01-36.0-300-032	BI-STATE PARKS AIRPORT	1400 UPPER CAHOKIA RD	East Saint Louis	470.22
09-14.0-100-001	THE UNITED STATES OF AMERICA	725 OUTER DR	Scott AFB	450.43
21-32.0-100-004	ZANDERS GLENDA S TRUSTEE	RISDON SCHOOL RD	Unincorporated	436.40
21-30.0-300-008	REID THOMAS III & THOMAS JR	9665 RISDON SCHOOL RD	Marissa	403.30
21-30.0-300-007	BRIDLE LAKE LLC	9991 RISDON SCHOOL RD	Marissa	394.80
02-28.0-200-002	FRANK HOLTEN STATE PARK	LAKE DR	Unincorporated	381.79
02-02.0-100-011	IL HIST PRESERVATION AGENCY	7200 COLLINSVILLE RD	Collinsville	375.71
04-13.0-100-011	RENNER FAMILY LTD RENNER THOMA	WIDICUS RD	Lebanon	356.51
02-34.0-100-003	FRANK HOLTEN STATE PARK	LAKE DR	Unincorporated	337.83

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All 148,902 parcels in St. Clair 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 St. Clair County?

The St. Clair County assessor roll on file records 148,902 parcels across 46 communities, with 5.8% lying outside any incorporated place.

Who owns the most land in St. Clair County?

ST CLAIR CO TRUSTEE holds 2,221 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in St. Clair County?

Measured from mapped boundaries, the median parcel is 0.24 acres, and nine parcels in ten are under 3.7 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of St. Clair County is owned from out of state?

8.1% of parcels list an owner mailing address outside IL, per the county’s own records.

How much of St. Clair County is government-owned?

Government entities — federal, state, and local — hold 4.4% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the St. Clair 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 (46)

148,902 parcels across 46 communities in St. Clair County.