County · code 40147
Washington CountyOklahoma
Washington County is a county in Oklahoma, with its seat in Bartlesville. It was created on November 16, 1907, from former Indian Territory and named after George Washington.
- Founded1907
- County seatBartlesville
- Named forGeorge Washington
- Land area416 sq mi + 8.8 sq mi water
- Population52,455 2020 Census
- Parcels mapped29,838 checked 15 October 2026
Where it is
Washington on the map of Oklahoma
Oklahoma has 77 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Founded in 1907
An old deed may name a county that no longer exists, or a boundary that has since moved.
Washington County was created on November 16, 1907, from former Indian Territory.
- 1907Washington County created Washington created from former Indian Territory. · Okla. Constitution [1907], art. 17, sec. 8; Swindler, 8:155
Land and parcels
What the maps cover in Washington
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 29,838 parcels. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 2 August 2024 · checked 15 October 2026 -
Address points Missing
No public address points layer found for Washington County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Washington by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Washington County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Washington County.
See your own lot on these maps
Open Washington County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Washington County
- When was Washington County founded?
- Washington County was founded in 1907, and named after George Washington.
- What is the county seat of Washington County?
- The county seat of Washington County is Bartlesville.
- Is there an online parcel map for Washington County?
- Yes. A public source publishes a parcel map of 29,838 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Washington County's boundary or name changed?
- Washington County was created in 1907. The Atlas of Historical County Boundaries records no boundary change since.
- Is my lot in a flood zone?
- We do not have flood maps for Washington County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby