County Maps US

Island County, Washington

A county in Washington, ranked 16 of 39 by population.

CountyFIPS 53029

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

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Population
85,657
-1,344 (-1.5%) since 2020
Land area
208.7
square miles. A further 59.7% of the total area is water
Population density
410
people per square mile, computed rather than published
County seat
Coupeville
Seat of county government.
Established
1853
172 years ago
Largest city
Oak Harbor city
Population 24,083.

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 Island 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 Island 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 551 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 Island 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
Population85,65716th of 39691st of 3,144
Land area208.7 sq mi38th of 392,987th of 3,144
Population density410 per sq mi7th of 39339th of 3,144
Median household income$90,5518th of 39288th of 3,143

Full data for Island County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population85,657Vintage 2025 Population Estimates
Population in 202087,001Vintage 2025 Population Estimates
2020 estimates base?86,856Vintage 2025 Population Estimates
Land area208.7 sq mi2025 Gazetteer Files
Water area308.6 sq mi2025 Gazetteer Files
Total area517.3 sq mi2025 Gazetteer Files
Population density?410 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$90,551American Community Survey 2020-2024 5-Year Estimates
Median home value$593,300American Community Survey 2020-2024 5-Year Estimates
Median age44.8American Community Survey 2020-2024 5-Year Estimates
Households35,972American Community Survey 2020-2024 5-Year Estimates
Housing units42,744American 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
-144
736 births, 880 deaths
Net migration
-175
More people moved out than moved in.

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

The 5 areas bordering Island 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
Snohomish CountyWashington36 mi870,656
Jefferson CountyWashington33 mi33,970
Skagit CountyWashington18 mi132,975
Kitsap CountyWashington14 mi283,374
San Juan CountyWashington7.5 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.