Madison County
Parcel & Property Data
About This Data
LandBrief holds 17,788 parcel records for Madison 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 Madison County assessor roll dated March 2022, loaded August 2026. See data sources for every county’s vintage.
Explore Madison County
Madison County by the Numbers
- Median parcel size
- 16.7 acres
measured from mapped boundaries - 90th-percentile parcel
- 39.6 acres
- County land area
- 359,044 acres
U.S. Census measurement - Communities
- 10
76.4% of parcels outside any incorporated place
Who Owns Madison County?
Share of the county’s 17,788 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 | 69.2% |
| Companies & organizations | 15.3% |
| Trusts & estates | 14.0% |
| Government | 1.1% |
| Other / unclassified | 0.5% |
The largest owner on record is MR2D LLC with 232 parcels — see the full landowner leaderboard.
Parcel Records (~17,788 total)
| Parcel ID | Owner | Address | City | Acreage |
|---|---|---|---|---|
| 520100620040000 | MARTIN MARIETTA MATERIALS, INC | 1900 COURT E WINTERSET | Unincorporated | 400.30 |
| 450083526010000 | BAKER, BRITT W. | — | Unincorporated | 345.46 |
| 840007300163000 | City Of Winterset, Lake | 4224 LAKEVIEW LN WINTERSET | Winterset | 249.28 |
| 030013100021000 | BUCK HAVEN ESTATES LLC | — | Unincorporated | 235.86 |
| 400073426100000 | South Central Iowa Landfill Agency | 2490 STATE HWY 92 WINTERSET | Unincorporated | 232.68 |
| 741153286010000 | STATE OF IOWA ACTING THROUGH DNR | — | Unincorporated | 210.46 |
| 450080522010000 | Quail Ridge Partners Lc | — | Unincorporated | 191.66 |
| 280050300011000 | Midwest Rock Products, Inc. | — | Unincorporated | 182.48 |
| 340061400010000 | BG3 FARMS LLCE 1/4 | — | Unincorporated | 177.43 |
| 741153200013000 | STATE OF IOWA ACTING THROUGH DNR | — | Unincorporated | 172.56 |
Download Madison County parcel data
All 17,788 parcels in Madison County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.
Get Madison County on FreeParcelData →Nearby counties
Frequently Asked Questions
How many parcels are in Madison County?
The Madison County assessor roll on file records 17,788 parcels across 10 communities, with 76.4% lying outside any incorporated place.
Who owns the most land in Madison County?
MR2D LLC holds 232 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.
What is the typical parcel size in Madison County?
Measured from mapped boundaries, the median parcel is 16.7 acres, and nine parcels in ten are under 39.6 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.
How much of Madison County is government-owned?
Government entities — federal, state, and local — hold 1.1% of the county’s parcels, classified from owner names on the roll.
How current is this data?
It comes from the Madison County assessor roll dated March 2022. 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 (10)
17,788 parcels across 10 communities in Madison County.