ZIP Codes of Jefferson County, WA

Population & People
Population & People
Total Population
32,270
Household Income
Household Income
Median Income
$78,421
Housing
Housing
Total Housing Units
18,835
Business & Economy
Business & Economy
Total Businesses
974
Employment
Employment
Employment Rate
41.65%
Education
Education
Bachelor's Degree+
45.10%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 7 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:7 ZIP Codes (7 Standard, 0 PO Box, 0 Unique) [See All]
Area Codes:360 / 564
Timezone:Pacific (GMT -08:00)
Local Time:11:55:35 PM
Population:32,270 [See All]
FIPS:53031
CBSA:Port Townsend, WA
Land Area:396 sq mi
Water Area:36 sq mi
Coordinates:47.9267, -122.8135
Quick Link:
https://www.zip-codes.com/county/wa-jefferson.asp
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Among America's 25 oldest counties
Median age 59.2 — #17 nationwide.
Among Washington's 5 most-educated counties
45.1% with bachelor's+ (#4 statewide).

Standout ZIPs in this County


Most Populous
Port Townsend · 17,304 people
53.6% of county total
Highest Income
Nordland · $110,368 median
1.4× county average
Largest Land Area
Brinnon · 150.1 sq mi
Spans the most ground
Fastest Growth
Port Hadlock · 20.3% (10-yr)
3,040 → 3,658 residents
Most Educated
Port Townsend · 51.2% bachelor's+
7,442 of 14,537 adults 25+

Things worth knowing about Jefferson County


32,270 residents live across 7 ZIPs covering 396 sq mi, served by 7 distinct USPS-recognized cities.

Population moved from 28,573 to 32,270 from 2014 to 2024 — a +12.9% change. 5 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 98358 (Nordland, $110,368 median) and poorest ZIP 98320 (Brinnon, $55,893) are 28.0 miles apart — a 2.0× income gap across local geography.

Median home values vary 2.7× across this county — from $285,200 in 98320 (Brinnon) to $756,000 in 98358 (Nordland).

Density varies 59× across the county — from 8 people/sq mi in 98320 (Brinnon) to 483 in 98339 (Port Hadlock).

Educational attainment ranges from 25.1% bachelor's+ in 98320 (Brinnon) to 51.2% in 98368 (Port Townsend) — the breadth of educational profiles across the area.

Within Washington, this is the #27 most populous of 39 counties and ranks #20 for median household income with the #17 fastest decade growth .

Weighted by population, the typical household earns about $75,968 across the county — reflecting what a typical resident sees, not a simple ZIP average.

45.1% of adults age 25+ hold a bachelor's degree or higher (12,313 of 27,303 reporting).

7 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.

All ZIP Codes in Jefferson County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
98368Port TownsendStandard17,304$69,68852.015.7%
98365Port LudlowStandard5,168$98,77639.914.7%
98339Port HadlockStandard3,658$77,7787.620.3%
98376QuilceneStandard1,982$57,250107.32.9%
98325ChimacumStandard1,775$79,19128.97.1%
98320BrinnonStandard1,219$55,893150.1-3.5%
98358NordlandStandard1,164$110,36810.7-4.4%

Adjacent & Nearby Counties