Jefferson County, Washington
County seat: Port Townsend · Population 33,970 (2025) · 1,804 sq mi
Jefferson County is the 27th most populous of Washington's 39 counties, with 33,970 people (2025 estimate). Its county seat is Port Townsend. The map shows its 1 city or town and the 6 neighboring counties.
Jefferson County facts
- County seat
- Port Townsend
- Population (2025 estimate)
- 33,970 +3% since 2020
- Land area
- 1,804 sq mi 18th largest of 39
- Water area
- 384 sq mi
- Population density
- 19 per sq mi
- Established
- 1852
- Same name
- One of 25 Jefferson Counties in the US
- Named after
- Thomas Jefferson Founding Father, U.S. president from 1801 to 1809 (1743–1826)
- Largest city
- Port Townsend 10,678
- Median household income
- $74,048
- Cities and towns
- 1 plus 6 CDPs
- ZIP codes
- 9
- Time zone
- Pacific
- FIPS code
- 53031
Cities and towns in Jefferson County
Jefferson County has 1 incorporated place. Populations count the people living inside Jefferson County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Port Townsend (county seat) | City | 10,678 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Port Hadlock-Irondale | 3,884 | |
| Port Ludlow | 2,891 | |
| Marrowstone | 1,164 | |
| Brinnon | 758 | |
| Quilcene | 362 | |
| Queets | 55 | Grays Harbor County |
ZIP codes in Jefferson County
9 ZIP codes reach into Jefferson County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 98320
- 98325
- 98331 also Clallam County
- 98339
- 98358
- 98365
- 98368
- 98376
- 98382 also Clallam County
Population of Jefferson County, 2020–2025
Jefferson County grew by 998 people (+3%) between April 2020 and July 2025: 1,432 more deaths than births and a net gain of 2,499 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 33,064 |
| 2021 | 33,558 |
| 2022 | 33,597 |
| 2023 | 33,715 |
| 2024 | 33,891 |
| 2025 | 33,970 |
Neighboring counties
- Clallam County northwest · 78,202 people
- Grays Harbor County south · 78,144 people
- Kitsap County east · 283,374 people
- Island County northeast · 85,657 people
- Mason County southeast · 71,165 people
- San Juan County north · 18,577 people
Printable Jefferson 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) (152 KB)
- PNG (2400 px) (117 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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