LandBrief

Rock Island County

Parcel & Property Data

66,001Total Parcels
—Avg. Market Value
237,700Total Acres

About This Data

LandBrief holds 66,001 parcel records for Rock Island 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 Rock Island County assessor roll dated July 2025, loaded August 2026. See data sources for every county’s vintage.

Explore Rock Island County

Rock Island County by the Numbers

Median parcel size
0.23 acres
measured from mapped boundaries
90th-percentile parcel
4.6 acres
County land area
273,597 acres
U.S. Census measurement
Communities
28
8.8% of parcels outside any incorporated place
Out-of-state owners
7.8% of parcels
by owner mailing address

Who Owns Rock Island County?

Share of the county’s 66,001 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
Individuals83.4%
Companies & organizations10.3%
Trusts & estates3.8%
Government1.8%
Other / unclassified0.7%

The largest owner on record is METRO AIR AUTH with 216 parcels — see the full landowner leaderboard.

Parcel Records (~66,001 total)

per page
Parcel IDOwnerAddressCityAcreage
1022200007KNUDTSON POTATO FARMS INC—Unincorporated669.82
2105100001LOUD THUNDER PARTNERS—Unincorporated653.78
1601306004HYVEE INC2810 18 AVERock Island641.00
1632100001CRAMER ROBERT—Unincorporated525.22
1818100001DEERE & CO/TAX DEPT—Unincorporated422.79
1720400007METRO AIR AUTH5600 69 AVEMilan346.82
1807300001DEERE & CO/TAX DEPT1 JOHN DEERE PLMoline333.38
0317100001CONSTELLATION ENERGY GENERATION LLC—Unincorporated327.69
1014400002TYSON FOODS INC28424 38TH AVE NHillsdale323.65
0535100005DECLERCQ EUGENE TRUSTEE—Unincorporated315.57
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All 66,001 parcels in Rock Island County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

Get Rock Island County on FreeParcelData →

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Frequently Asked Questions

How many parcels are in Rock Island County?

The Rock Island County assessor roll on file records 66,001 parcels across 28 communities, with 8.8% lying outside any incorporated place.

Who owns the most land in Rock Island County?

METRO AIR AUTH holds 216 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Rock Island County?

Measured from mapped boundaries, the median parcel is 0.23 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 Rock Island County is owned from out of state?

7.8% of parcels list an owner mailing address outside IL, per the county’s own records.

How much of Rock Island County is government-owned?

Government entities — federal, state, and local — hold 1.8% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Rock Island 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 (28)

66,001 parcels across 28 communities in Rock Island County.