LandBrief

Jefferson County

Parcel & Property Data

105,511Total Parcels
—Avg. Market Value
391,953Total Acres

About This Data

LandBrief holds 105,511 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 June 2025, loaded August 2026. See data sources for every county’s vintage.

Explore Jefferson County

Jefferson County by the Numbers

Median parcel size
0.44 acres
measured from mapped boundaries
90th-percentile parcel
6.5 acres
County land area
420,009 acres
U.S. Census measurement
Communities
39
18.8% of parcels outside any incorporated place
Out-of-state owners
2.6% of parcels
by owner mailing address

Who Owns Jefferson County?

Share of the county’s 105,511 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
Individuals81.3%
Companies & organizations9.0%
Trusts & estates9.0%
Government0.5%
Other / unclassified0.3%

The largest owner on record is ARNOLD CITY OF with 462 parcels — see the full landowner leaderboard.

Parcel Records (~105,511 total)

per page
Parcel IDOwnerAddressCityAcreage
19-5.0-21.0-0-000-001.SELMA FARM LLC555 KENNETT CASTLE LNUnincorporated678.43
19-5.0-22.0-0-000-001.RIVER CEMENT CO ATTN TAX DEPT1000 RIVER CEMENT RDUnincorporated534.90
04-7.0-26.0-0-000-002.CONSERVATION COMMISSION OF MO—LaBarque Creek534.00
12-3.0-06.1-0-000-017.MARJORIE V PHELPS FARMS8114 KLONDIKE FARMS RDUnincorporated532.42
27-3.0-05.0-0-000-001.VALLE MINING CO14161 VALLES MINES SCHOOL RDValles Mines531.09
03-1.0-02.0-0-000-001.ST LOUIS AREA COUNCIL BOY5200 BEAUMONT RESERVATION DRUnincorporated507.50
19-7.0-26.0-0-000-001.RIVER CEMENT CO1200 DOOLING HOLLOW RDFestus468.79
26-1.0-12.0-0-000-001.VALLE MINING CO—Unincorporated458.01
04-1.0-11.0-0-000-001.HOENE JAMES R TRUST—Unincorporated457.03
16-4.0-20.0-0-000-006.01INDIAN ROCK FARM LLC7550 HAMMEL RDDe Soto455.65
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Download Jefferson County parcel data

All 105,511 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 105,511 parcels across 39 communities, with 18.8% lying outside any incorporated place.

Who owns the most land in Jefferson County?

ARNOLD CITY OF holds 462 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 0.44 acres, and nine parcels in ten are under 6.5 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Jefferson County is owned from out of state?

2.6% of parcels list an owner mailing address outside MO, per the county’s own records.

How much of Jefferson County is government-owned?

Government entities — federal, state, and local — hold 0.5% 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 June 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 (39)

105,511 parcels across 39 communities in Jefferson County.