County Maps US

Washington County, Oklahoma

A county in Oklahoma, ranked 15 of 77 by population.

CountyFIPS 40147

Within Oklahoma
Washington County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Bartlesville, the county seat, located via the 2025 Census Gazetteer.

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Population
54,037
+1,424 (+2.7%) since 2020
Land area
415.5
square miles. A further 2.1% of the total area is water
Population density
130
people per square mile, computed rather than published
County seat
Bartlesville
Seat of county government.
Established
1907
118 years ago
Largest city
Bartlesville city
Population 38,276 for the whole place, which extends beyond this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Washington County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Washington County, Oklahoma from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 299 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Washington County ranks

Position among the 77 counties of Oklahoma, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn OklahomaNationally
Population54,03715th of 77964th of 3,144
Land area415.5 sq mi76th of 772,434th of 3,144
Population density130 per sq mi7th of 77759th of 3,144
Median household income$60,16237th of 772,068th of 3,143

Full data for Washington County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population54,037Vintage 2025 Population Estimates
Population in 202052,613Vintage 2025 Population Estimates
2020 estimates base?52,451Vintage 2025 Population Estimates
Land area415.5 sq mi2025 Gazetteer Files
Water area8.8 sq mi2025 Gazetteer Files
Total area424.4 sq mi2025 Gazetteer Files
Population density?130 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$60,162American Community Survey 2020-2024 5-Year Estimates
Median home value$173,200American Community Survey 2020-2024 5-Year Estimates
Median age39.2American Community Survey 2020-2024 5-Year Estimates
Households20,957American Community Survey 2020-2024 5-Year Estimates
Housing units23,741American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-170
580 births, 750 deaths
Net migration
+311
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Washington County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Osage CountyOklahoma40 mi46,794
Nowata CountyOklahoma29 mi9,522
Rogers CountyOklahoma12 mi102,197
Tulsa CountyOklahoma11 mi698,782
Montgomery CountyKansas9.8 mi30,177
Chautauqua CountyKansas2.0 mi3,321

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 77 counties of Oklahoma

Open the interactive Oklahoma county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.