Warren County
Parcel & Property Data
About This Data
LandBrief holds 14,192 parcel records for Warren 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 Warren County assessor roll dated July 2025, loaded August 2026. See data sources for every county’s vintage.
Explore Warren County
Warren County by the Numbers
- Median parcel size
- 1 acres
measured from mapped boundaries - 90th-percentile parcel
- 81.5 acres
- County land area
- 347,086 acres
U.S. Census measurement - Communities
- 12
42.2% of parcels outside any incorporated place - Out-of-state owners
- 6.0% of parcels
by owner mailing address
Who Owns Warren County?
Share of the county’s 14,192 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 | 70.7% |
| Companies & organizations | 8.7% |
| Trusts & estates | 15.8% |
| Government | 3.8% |
| Other / unclassified | 1.0% |
The largest owner on record is DEPARTMENT OF TRANSPORTATION with 217 parcels — see the full landowner leaderboard.
Parcel Records (~14,192 total)
| Parcel ID | Owner | Address | City | Acreage |
|---|---|---|---|---|
| 0102600100 | IRWIN CAROLYN W CO-TRUSTEE | NO SITE ADDRESS | Unincorporated | 640.00 |
| 0202300300 | CHANDLER CONNIE L | NO SITE ADDRESS | Unincorporated | 320.00 |
| 0103500100 | SPURGEON HAROLD A TRUSTEE | 72 170TH ST | Avon | 320.00 |
| 1403500100 | WALTERS WAYNE TRUSTEE | 473 185TH AVE | Monmouth | 320.00 |
| 1102000200 | PETERSON R CO-TRUSTEE | NO SITE ADDRESS | Unincorporated | 320.00 |
| 0702100100 | CORZATT BRADLEY T | 846 90TH ST | Berwick | 320.00 |
| 0602400100 | MITCHELL W KEENAN | 1187 30TH AVE | Roseville | 320.00 |
| 1302900100 | TOMPKINS FARMS LLC | NO SITE ADDRESS | Unincorporated | 320.00 |
| 0201600100 | HALE FAMILY LTD PARTNERSHIP | 1458 90TH AVE | Berwick | 319.90 |
| 0302500500 | TURNER ROBERT C TRUSTEE | 1341 170TH ST | Cameron | 318.00 |
Download Warren County parcel data
All 14,192 parcels in Warren County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.
Get Warren County on FreeParcelData →Nearby counties
Frequently Asked Questions
How many parcels are in Warren County?
The Warren County assessor roll on file records 14,192 parcels across 12 communities, with 42.2% lying outside any incorporated place.
Who owns the most land in Warren County?
DEPARTMENT OF TRANSPORTATION holds 217 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.
What is the typical parcel size in Warren County?
Measured from mapped boundaries, the median parcel is 1 acres, and nine parcels in ten are under 81.5 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.
How much of Warren County is owned from out of state?
6.0% of parcels list an owner mailing address outside IL, per the county’s own records.
How much of Warren County is government-owned?
Government entities — federal, state, and local — hold 3.8% of the county’s parcels, classified from owner names on the roll.
How current is this data?
It comes from the Warren 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 (12)
14,192 parcels across 12 communities in Warren County.