Mason County
Parcel & Property Data
About This Data
LandBrief holds 16,248 parcel records for Mason 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 Mason County assessor roll dated July 2025, loaded August 2026. See data sources for every county’s vintage.
Explore Mason County
Mason County by the Numbers
- Median parcel size
- 1.1 acres
measured from mapped boundaries - 90th-percentile parcel
- 77.8 acres
- County land area
- 345,185 acres
U.S. Census measurement - Communities
- 12
57.6% of parcels outside any incorporated place - Out-of-state owners
- 6.6% of parcels
by owner mailing address
Who Owns Mason County?
Share of the county’s 16,248 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 | 76.1% |
| Companies & organizations | 9.9% |
| Trusts & estates | 10.2% |
| Government | 3.4% |
| Other / unclassified | 0.6% |
The largest owner on record is STATE OF ILL with 156 parcels — see the full landowner leaderboard.
Parcel Records (~16,248 total)
| Parcel ID | Owner | Address | City | Acreage |
|---|---|---|---|---|
| 1006308001 | J & C GRIFFIN FAMILY REAL ESTATE TRUST GARY GRIFFIN SPECIAL NEEDS TRUST | 509 E RAYMOND HAVANA IL 62644 | Havana | 1929.00 |
| 1623100001 | STATE OF ILL | — | Unincorporated | 640.00 |
| 2103100001 | STATE OF ILL | — | Unincorporated | 640.00 |
| 0235100001 | STATE OF ILL | — | Unincorporated | 640.00 |
| 0227100001 | STATE OF ILL | — | Unincorporated | 640.00 |
| 0234100001 | STATE OF ILL | — | Unincorporated | 640.00 |
| 0602100001 | STATE OF ILL | — | Unincorporated | 637.50 |
| 2314100001 | SKILLET FORK FARM LTD | — | Unincorporated | 635.05 |
| 2320100001 | NORTHERN AGRICULTURE LLC | — | Unincorporated | 634.41 |
| 0509100001 | U S A | — | Unincorporated | 626.00 |
Download Mason County parcel data
All 16,248 parcels in Mason County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.
Get Mason County on FreeParcelData →Nearby counties
Frequently Asked Questions
How many parcels are in Mason County?
The Mason County assessor roll on file records 16,248 parcels across 12 communities, with 57.6% lying outside any incorporated place.
Who owns the most land in Mason County?
STATE OF ILL holds 156 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.
What is the typical parcel size in Mason County?
Measured from mapped boundaries, the median parcel is 1.1 acres, and nine parcels in ten are under 77.8 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.
How much of Mason County is owned from out of state?
6.6% of parcels list an owner mailing address outside IL, per the county’s own records.
How much of Mason County is government-owned?
Government entities — federal, state, and local — hold 3.4% of the county’s parcels, classified from owner names on the roll.
How current is this data?
It comes from the Mason 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)
16,248 parcels across 12 communities in Mason County.