County Maps US

Thurston County, Washington

A county in Washington, ranked 6 of 39 by population.

CountyFIPS 53067

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

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Population
304,261
+8,248 (+2.8%) since 2020
Land area
722.5
square miles. A further 6.7% of the total area is water
Population density
421
people per square mile, computed rather than published
County seat
Olympia
Seat of county government.
Established
1852
173 years ago
Largest city
Lacey city
Population 58,833.

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 Thurston 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 Thurston County, Washington 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 800 by 534 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 Thurston County ranks

Position among the 39 counties of Washington, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn WashingtonNationally
Population304,2616th of 39243rd of 3,144
Land area722.5 sq mi32nd of 391,235th of 3,144
Population density421 per sq mi5th of 39332nd of 3,144
Median household income$96,5636th of 39205th of 3,143

Full data for Thurston County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population304,261Vintage 2025 Population Estimates
Population in 2020296,013Vintage 2025 Population Estimates
2020 estimates base?294,790Vintage 2025 Population Estimates
Land area722.5 sq mi2025 Gazetteer Files
Water area51.6 sq mi2025 Gazetteer Files
Total area774.1 sq mi2025 Gazetteer Files
Population density?421 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$96,563American Community Survey 2020-2024 5-Year Estimates
Median home value$480,300American Community Survey 2020-2024 5-Year Estimates
Median age40.0American Community Survey 2020-2024 5-Year Estimates
Households118,899American Community Survey 2020-2024 5-Year Estimates
Housing units125,163American 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
+80
2,873 births, 2,793 deaths
Net migration
+2,040
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 4 areas bordering Thurston 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
Pierce CountyWashington62 mi946,288
Lewis CountyWashington48 mi88,062
Mason CountyWashington25 mi71,165
Grays Harbor CountyWashington22 mi78,144

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

All 39 counties of Washington

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

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