Washington County
Parcel & Property Data
About This Data
LandBrief holds 30,084 parcel records for Washington 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 Washington County assessor roll dated July 2025, loaded August 2026. See data sources for every county’s vintage.
Explore Washington County
Washington County by the Numbers
- Median parcel size
- 0.29 acres
measured from mapped boundaries - 90th-percentile parcel
- 15.1 acres
- County land area
- 265,935 acres
U.S. Census measurement - Communities
- 11
13.7% of parcels outside any incorporated place - Out-of-state owners
- 5.5% of parcels
by owner mailing address
Who Owns Washington County?
Share of the county’s 30,084 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 | 69.7% |
| Companies & organizations | 12.3% |
| Trusts & estates | 13.8% |
| Government | 1.2% |
| Other / unclassified | 3.0% |
The largest owner on record is BARTLESVILLE CITY with 226 parcels — see the full landowner leaderboard.
Parcel Records (~30,084 total)
| Parcel ID | Owner | Address | City | Acreage |
|---|---|---|---|---|
| 740009053 | MITCHELL JAY A II | 200 E 10TH ST | Bartlesville | 0.54 † |
| 740004563 | FESLER MACKENZIE | 201 E 10TH ST | Dewey | 0.12 † |
| 740004564 | B & B UNLIMITED LLC | 209 E 10TH ST | Dewey | 0.24 † |
| 740004551 | ALDANA ANGELA | 301 E 10TH ST | Dewey | 0.16 † |
| 740004552 | HEINEMAN TYLER & MACI | 309 E 10TH ST | Dewey | 0.16 † |
| 740024790 | FIRST BAPTIST CHURCH OF DEWEY | 314 E 10TH ST | Dewey | 0.16 † |
| 740004553 | GILLILAND GERALD D REVOC TRUST & AS TRUSTEE | 315 E 10TH ST | Dewey | 0.16 † |
| 740004554 | GILLILAND GERALD D REVOC TRUST & AS TRUSTEE | 315 E 10TH ST | Dewey | 0.16 † |
| 740004578 | STEFFEN DEBRA JO | 322 E 10TH ST | Dewey | 0.12 † |
| 740004582 | CARITHERS NICHOLAS A | 402 E 10TH ST | Dewey | 0.32 † |
Download Washington County parcel data
All 30,084 parcels in Washington County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.
Get Washington County on FreeParcelData →Nearby counties
Frequently Asked Questions
How many parcels are in Washington County?
The Washington County assessor roll on file records 30,084 parcels across 11 communities, with 13.7% lying outside any incorporated place.
Who owns the most land in Washington County?
BARTLESVILLE CITY holds 226 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.
What is the typical parcel size in Washington County?
Measured from mapped boundaries, the median parcel is 0.29 acres, and nine parcels in ten are under 15.1 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.
How much of Washington County is owned from out of state?
5.5% of parcels list an owner mailing address outside OK, per the county’s own records.
How much of Washington County is government-owned?
Government entities — federal, state, and local — hold 1.2% of the county’s parcels, classified from owner names on the roll.
How current is this data?
It comes from the Washington 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 (11)
30,084 parcels across 11 communities in Washington County.