Jefferson County, Washington Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 27th-largest in Washington
The population of Jefferson County, Washington is 33,313 as of the 2023 American Community Survey, making it the 27th-largest county in Washington. The median household income is $71,143, the median home value is $495,100, and the median age is 59.5.
The population of Jefferson County has grown 13.5% since 2010 (29,899 → 33,944), a +0.91% annualized rate.
33,313
Population
+0.91%
Annual growth
18
People / sq mi
$71,143
Median Income
$495,100
Median Home Value
Jefferson County covers 1,804 sq mi of land at 18.5 people per square mile.
About Jefferson County, WA
Jefferson County is a county in Washington with a population of 33,313. It ranks #27 among counties in Washington by population. The median age is 59.5, older than the national median. The population is 48.8% male and 51.2% female.
The median household income in Jefferson County is $71,143, near the US median of $74,580. 7.7% of residents live below the federal poverty level. Home values sit at a median of $495,100, with monthly rent averaging $1,291. The homeownership rate of 79.7% is higher than the national rate of 64.8%.
Educational attainment in Jefferson County reflects 43.3% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 21.5% of workers primarily work from home, noticeably above the national work-from-home rate of 14.2%. The average commute is 23.5 minutes each way.
Jefferson County Population History (2010-2024)
The county of Jefferson County had a population of 29,899 in 2010 and 33,944 in 2024, a 13.5% growth over 14 years. The peak was 33,944 in 2024. Average annual growth rate: 0.91%.
33,944
Population (2024)
29,899
Population (2010)
33,944
Peak (2024)
0.91%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 29,899 |
| 2011 | 29,858 |
| 2012 | 29,808 |
| 2013 | 30,021 |
| 2014 | 30,172 |
| 2015 | 30,376 |
| 2016 | 30,949 |
| 2017 | 31,264 |
| 2018 | 31,864 |
| 2019 | 32,347 |
| 2020 | 33,061 |
| 2021 | 33,558 |
| 2022 | 33,597 |
| 2023 | 33,725 |
| 2024 | 33,944 |
Race & Ethnicity
| White | 86.7% |
| Black or African American | 0.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 4.3% |
| Two or More Races | 0.0% |
Age & Sex
59.5
Median Age
51.2%
Female
48.8%
Male
39.6%
Age 65+
Age Distribution
Children (under 15): 9.5% · Seniors (65+): 39.6%
Income & Poverty
| Median household income | $71,143$-23,809 vs state |
| Mean household income | $101,205 |
| Per-capita income | $49,853 |
| Poverty rate | 7.7%+1.3% vs state |
| Unemployment rate | 3.3% |
| Employment-to-population | 39.6% |
Top Industries by Employment
The largest employment sector in Jefferson County is professional & business services, accounting for 22.6% of workers.
How residents commute
1.5%
Drive alone
4.4%
Carpool
62.1%
Public transit
21.5%
Work from home
23.5 min
Avg commute
Housing
$495,100$-24,700 vs state
Median home value
$1,291
Median rent
79.7%
Homeownership rate
19,359
Total housing units
83.5%
Occupied
16.5%
Vacant
20.3%
Renter-occupied
Social & access
95.9%
With health insurance
94.2%
With broadband internet
54.9%
Foreign-born
12.1%
Veterans (18+)
20.0%
With a disability
92.7%
Speak language other than English at home
Education
96.1%
High School+
43.3%
Bachelor's+
Largest cities in Washington
Other counties in Washington
Part of Washington
Metro areas in Washington
County rankings
Frequently Asked Questions
Jefferson County, Washington has a population of 33,313 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 27th-largest county in Washington. Population density is 18 people per square mile.
The population of Jefferson County has grown 13.5% since 2010 (29,899 → 33,944), a +0.91% annualized rate.
The median household income in Jefferson County, Washington is $71,143, with mean (average) household income of $101,205 and per-capita income of $49,853. 7.7% of residents live below the federal poverty level.
In Jefferson County, the largest racial and ethnic groups are White (86.7%), Hispanic or Latino (4.3%), Black or African American (0.4%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Jefferson County, Washington is 59.5 years. Residents are 51.2% female and 48.8% male.
The median home value in Jefferson County is $495,100 and median monthly rent is $1,291. 79.7% of occupied housing units are owner-occupied. The county has 19,359 total housing units, 16.5% of which are vacant.
The largest employment sector in Jefferson County, Washington is professional, scientific, and management services, employing 22.6% of workers. The unemployment rate is 3.3%.
Seattle is among the largest cities associated with Jefferson County, Washington, with a population of 741,440.
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Full rankings of Washington counties
Statewide data for Washington
Population, race, income, age, and trends across Washington
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.