Island County, Washington
County seat: Coupeville · Population 85,657 (2025) · 209 sq mi
Island County is the 16th most populous of Washington's 39 counties, with 85,657 people (2025 estimate). Its county seat is Coupeville. The map shows its 3 cities and towns and the 5 neighboring counties.
Island County facts
- County seat
- Coupeville
- Population (2025 estimate)
- 85,657 −1.4% since 2020
- Land area
- 209 sq mi 38th largest of 39
- Water area
- 309 sq mi
- Population density
- 410 per sq mi
- Established
- 1852
- Named after
- Whidbey Island island in the Salish Sea in Washington, United States
- Largest city
- Oak Harbor 24,083
- Median household income
- $90,551
- Cities and towns
- 3 plus 4 CDPs
- ZIP codes
- 8
- Time zone
- Pacific
- FIPS code
- 53029
Cities and towns in Island County
Island County has 3 incorporated cities, towns and villages. Populations count the people living inside Island County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Oak Harbor | City | 24,083 | |
| Coupeville (county seat) | Town | 1,920 | |
| Langley | City | 1,129 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Camano | 17,303 | |
| Whidbey Island Station | 2,027 | |
| Freeland | 1,548 | |
| Clinton | 1,419 |
ZIP codes in Island County
8 ZIP codes reach into Island County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 98236
- 98239
- 98249
- 98253
- 98260
- 98277
- 98278
- 98282 also Snohomish County
Population of Island County, 2020–2025
Island County shrank by 1,199 people (−1.4%) between April 2020 and July 2025: 763 more deaths than births and a net loss of 307 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 87,001 |
| 2021 | 87,606 |
| 2022 | 86,738 |
| 2023 | 86,194 |
| 2024 | 85,982 |
| 2025 | 85,657 |
Neighboring counties
- Snohomish County east · 870,656 people
- Jefferson County southwest · 33,970 people
- Skagit County northeast · 132,975 people
- Kitsap County south · 283,374 people
- San Juan County northwest · 18,577 people
Printable Island County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (126 KB)
- PNG (2400 px) (151 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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