County Maps US

Jefferson County, Washington

A county in Washington, ranked 27 of 39 by population.

CountyFIPS 53031

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

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Population
33,970
+906 (+2.7%) since 2020
Land area
1,804
square miles. A further 17.6% of the total area is water
Population density
18.8
people per square mile, computed rather than published
County seat
Port Townsend
Seat of county government.
Established
1852
173 years ago
Largest city
Port Townsend city
Population 10,678.

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 Jefferson 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 Jefferson 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 419 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 Jefferson 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
Population33,97027th of 391,344th of 3,144
Land area1,804 sq mi18th of 39327th of 3,144
Population density18.8 per sq mi29th of 392,284th of 3,144
Median household income$74,04821st of 39905th of 3,143

Full data for Jefferson County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population33,970Vintage 2025 Population Estimates
Population in 202033,064Vintage 2025 Population Estimates
2020 estimates base?32,972Vintage 2025 Population Estimates
Land area1,804 sq mi2025 Gazetteer Files
Water area384.2 sq mi2025 Gazetteer Files
Total area2,188 sq mi2025 Gazetteer Files
Population density?18.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$74,048American Community Survey 2020-2024 5-Year Estimates
Median home value$535,000American Community Survey 2020-2024 5-Year Estimates
Median age59.8American Community Survey 2020-2024 5-Year Estimates
Households16,340American Community Survey 2020-2024 5-Year Estimates
Housing units19,534American 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
-269
137 births, 406 deaths
Net migration
+355
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 Jefferson 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
Clallam CountyWashington121 mi78,202
Grays Harbor CountyWashington44 mi78,144
Kitsap CountyWashington35 mi283,374
Island CountyWashington33 mi85,657
Mason CountyWashington32 mi71,165
San Juan CountyWashington4.4 mi18,577

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.