LandBrief

Jefferson County

Parcel & Property Data

18,335Total Parcels
—Avg. Market Value
265,234Total Acres

About This Data

LandBrief holds 18,335 parcel records for Jefferson 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 Jefferson County assessor roll dated November 2022, loaded August 2026. See data sources for every county’s vintage.

Explore Jefferson County

Jefferson County by the Numbers

Median parcel size
4.7 acres
measured from mapped boundaries
90th-percentile parcel
39.8 acres
County land area
278,735 acres
U.S. Census measurement
Communities
17
52.3% of parcels outside any incorporated place

Who Owns Jefferson County?

Share of the county’s 18,335 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
Individuals76.0%
Companies & organizations14.8%
Trusts & estates7.5%
Government0.4%
Other / unclassified1.3%

The largest owner on record is M U M with 170 parcels — see the full landowner leaderboard.

Parcel Records (~18,335 total)

per page
Parcel IDOwnerAddressCityAcreage
0611300008FAIRFIELD CITY OF—Unincorporated230.59
0524300005ATWOOD NORMAN/DORIAN M REV TST—Unincorporated178.73
0729400004HEARTLAND CO-OP2081 NUTMEG AVEFairfield158.61
0710200008MADISON AVENUE FARMS LLC170TH STUnincorporated148.38
1222100006ANDERSON NELSON B/JENNIFER B REVOCABLE TRUST—Unincorporated147.61
1129400007DYER JOSEPH CROSS/CHERYL ANN—Unincorporated147.46
0117400008JLJA DEUTSCHLAND LLC—Unincorporated138.68
0628200008IOWA NATURAL HERITAGE FOUNDATION—Unincorporated129.43
0412400014ROBISON LAWRENCE/SARAH TST—Unincorporated123.20
0809200010ROBERTSON RYAN/DEUTSCH J ETAL—Unincorporated119.04
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Download Jefferson County parcel data

All 18,335 parcels in Jefferson County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

Get Jefferson County on FreeParcelData →

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Frequently Asked Questions

How many parcels are in Jefferson County?

The Jefferson County assessor roll on file records 18,335 parcels across 17 communities, with 52.3% lying outside any incorporated place.

Who owns the most land in Jefferson County?

M U M holds 170 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Jefferson County?

Measured from mapped boundaries, the median parcel is 4.7 acres, and nine parcels in ten are under 39.8 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Jefferson County is government-owned?

Government entities — federal, state, and local — hold 0.4% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Jefferson County assessor roll dated November 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 (17)

18,335 parcels across 17 communities in Jefferson County.