Jefferson County, WA demographics:
population, income, and more

Total population
33,577
0.8% year-over-year change
Median household income
$74,048/yr
4.1% year-over-year change
Housing units
19,534
0.9% year-over-year change

Jefferson County population

How many people live in Jefferson County

Jefferson County is home to 33,577 residents, according to the most recent Census data. Gender-wise, 48.8% of Jefferson County locals are male, and 51.2% are female.

Total population
33,577
0.8% year-over-year change
Gender ratio
Male
48.8%
16,369
Female
51.2%
17,208
Value Percent YoY change
Male 16,369 48.8% 0.6%
Female 17,208 51.2% 1.0%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Jefferson County is 60, with the population distributed as follows: about 9% are children under 15, then 5.9% are in the 15 to 24 age group. Adults between 25 and 44 make up 17.9% of the population, while another 26.4% fall into the 45 to 64 bracket. Finally, around 40.7% are 65 or older.

Median age
59.8
Age breakdown
Under 15
9%
15 to 24
5.9%
25 to 44
17.9%
45 to 64
26.4%
Over 65
40.7%
Value Percent YoY change
Under 15 3,034 9% -4.2%
15 to 24 1,991 5.9% 4.1%
25 to 44 6,001 17.9% -1.0%
45 to 64 8,878 26.4% -1.3%
Over 65 13,673 40.7% 3.7%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Jefferson County, 93.1% of the population are US-born citizens, while 5% have gained naturalized citizenship. At the same time, 1.9% of residents are non-citizens. As for race, 85.6% of locals are Caucasian, 0.4% are African American and 1.3% have Asian roots. Another 1.1% are Indigenous American, 0.1% are Pacific Islanders, while 2.3% identify as another race. There’s also a share of 9.3% that includes residents with two or more races.

Citizenship
U.S.-born citizens
93.1%
Non-U.S.-born citizens
5%
Non-citizens
1.9%
Value Percent YoY change
U.S.-born citizens 31,253 93.1% 1.0%
Non-U.S.-born citizens 1,676 5% 7.8%
Non-citizens 648 1.9% -21.2%
Racial breakdown
White
85.6%
Black or African American
0.4%
American Indian and Alaska Native
1.1%
Asian
1.3%
Native Hawaiian and other Pacific Islander
0.1%
Two or more races
9.3%
Other
2.3%
Value Percent
White 28,727 85.6%
Black or African American 131 0.4%
American Indian and Alaska Native 357 1.1%
Asian 434 1.3%
Native Hawaiian and other Pacific Islander 35 0.1%
Two or more races 3,108 9.3%
Other 785 2.3%

Households in Jefferson County

A peek inside Jefferson County households

Jefferson County has 16,340 households, with an average of 2 members in each. Of these, 58.8% are families, while the remaining 41.2% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
16,340
1.1% year-over-year change
Average people per household
2
Non-family households
6,725
Family households
9,615
Value Percent YoY change
Non-family households 6,725 41.2% 0.2%
Family households 9,615 58.8% 1.8%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Jefferson County

The housing landscape of Jefferson County

Jefferson County's housing consists of 19,534 units, with 79.6% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 2.3% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 9.3% of the housing landscape.

Housing units
19,534
0.9% year-over-year change
Housing types
Value Percent
1 unit, detached 15,559 79.6%
1 unit, attached 457 2.3%
2 units 212 1.1%
3 or 4 units 361 1.8%
5 to 9 units 242 1.2%
10 to 19 units 219 1.1%
20 to 49 units 314 1.6%
50 or more units 217 1.1%
Mobile home 1,811 9.3%
Boat, RV, van, etc. 142 0.7%
Homes built since 2020
524
85.8% year-over-year change

The age of buildings in Jefferson County

In Jefferson County, the median construction year is 1988. About 11.5% of homes were built before the 1940s, with another 2.8% going up by 1949. Most development happened in the second half of the 20th century. Then, 16.4% of homes were added from 2000 to 2009, 9.6% between 2010 and 2019, and 2.7% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 2,249 11.5% 14.6%
Built between 1940 and 1949 541 2.8% 33.9%
Built between 1950 and 1959 567 2.9% 3.5%
Built between 1960 and 1969 1,340 6.9% -1.8%
Built between 1970 and 1979 2,685 13.8% -11.2%
Built between 1980 and 1989 2,939 15% -7.6%
Built between 1990 and 1999 3,601 18.4% -5.2%
Built between 2000 and 2009 3,210 16.4% 3.0%
Built between 2010 and 2019 1,878 9.6% 11.8%
Built in 2020 or later 524 2.7% 85.8%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Jefferson County occupancy rates

Out of the 16,340 occupied housing units in Jefferson County, 79% are owner-occupied, while 21% are lived in by tenants. Meanwhile, 16.4% of all homes on the local market sit vacant.

Occupied housing units
16,340
1.1% year-over-year change
Occupancy breakdown
Renter occupied
3,424
Owner occupied
12,916
Value Percent YoY
change
Renter occupied 3,424 21% 4.4%
Owner occupied 12,916 79% 0.3%
Unoccupied housing units
16.4%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Jefferson County housing costs

Housing costs in Jefferson County come to a median of $1,219 per month, while tenants specifically pay a median gross rent of $1,522.

Median housing costs per month
$1,219/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Jefferson County
$1,522/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Jefferson County

Jefferson County education at a glance

About 25.1% of the population in Jefferson County went to high school, while 24.1% pursued college studies. Another 7.4% earned an associate degree and 23.7% hold a bachelor’s. Meanwhile, 18.8% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 282 1% 26.5%
High school diploma 7,488 25.1% 4.2%
College diploma 7,194 24.1% -1.6%
Associate degree 2,195 7.4% -8.8%
Bachelor's degree 7,071 23.7% 4.2%
Graduate degree 5,600 18.8% 0.7%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Jefferson County

How much people earn in Jefferson County

The average annual household income in Jefferson County was $104,756 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +3.5% change from the previous year. At the same time, the median income stood at $74,048, reflecting a +4.1% shift over the same period.

Average household income in Jefferson County
$104,756/year
3.5% year-over-year change
Median household income in Jefferson County
$74,048/year
4.1% year-over-year change

Jefferson County income by age

In Jefferson County, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $85,969. Those with someone between 45 and 64 in charge, often well established professionally, earn $87,500 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $96,012, while those led by someone over 65, many of whom may be retired, have about $65,503 in earnings. Overall, 88.9% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $96,012 2.9%
25 - 44 $85,969 2.6%
45 - 64 $87,500 8.0%
Over 65 $65,503 2.0%
Above poverty level
29,290
Below poverty level
3,661
Value Percent YoY
change
Above poverty level 29,290 88.9% 2.7%
Below poverty level 3,661 11.1% -10.1%

Employment in Jefferson County

Workforce and job types in Jefferson County

The job market in Jefferson County is powered by 12,285 working residents, spread across a range of industries and roles. 79.4% of the working population are employed in professional or administrative positions, while 20.6% are in hands-on or service-based jobs. Also, 23.6% run their own businesses, 46.2% are employed by private companies, and 17.5% work in the public sector.

Workforce demographics

Working population
12,285
3.8% year-over-year change
White collar
9,757
Blue collar
2,528
Value Percent YoY change
White collar 9,757 79.4% 6.8%
Blue collar 2,528 20.6% -6.1%
Employer type
Self employees
23.6%
Private companies
46.2%
Governmental workers
17.5%
Not for profit companies
12.7%
Value Percent YoY change
Self employees 2,906 23.6% 3.3%
Private companies 5,677 46.2% 0.9%
Governmental workers 2,145 17.5% -2.1%
Not for profit companies 1,557 12.7% 29.4%
Unemployment rate
6.6%
-11.0% year-over-year change

Available workforce

The unemployment rate in Jefferson County stands at 6.6%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Jefferson County

How people get around in Jefferson County

Commuting methods vary: 69% of residents travel by personal vehicle and 4.6% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 8,419 69% 0.8%
Taxicab 18 0.2% N/A
Bus or trolleybus 8 0.1% -92.9%
Ferryboat 58 0.5% -4.9%
Motorcycle 54 0.4% 22.7%
Bicycle 80 0.7% -28.6%
Walk 566 4.6% 8.4%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Jefferson County by zipcode?

Zipcode Population Number of households Median income Average income
98331 5,826 2,397 $62,135 $73,043
98339 3,658 1,538 $77,778 $90,904
98365 5,168 2,629 $98,776 $137,420
98368 17,304 8,839 $69,688 $101,732
98376 1,982 940 $57,250 $78,033
98358 1,164 519 $110,368 $156,351
98320 1,219 564 $55,893 $72,389
98325 1,775 794 $79,191 $100,540

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FAQs about Jefferson County demographics 

What is the total population of Jefferson County?

Jefferson County has a total population of 33,577 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by +0.8% compared to a year ago.

What is the gender ratio in Jefferson County?

The gender ratio in Jefferson County is as follows:
  • 48.8% males (16,369 residents)
  • 51.2% females (17,208 residents)

What is the median age in Jefferson County?

The median age in Jefferson County is 59.8.

What is the age distribution of the population in Jefferson County?

The age distribution in Jefferson County is as follows:
  • Under 15: 9% (3,034 residents)
  • Ages 15-24: 5.9% (1,991 residents)
  • Ages 25-44: 17.9% (6,001 residents)
  • Ages 45-64: 26.4% (8,878 residents)
  • Over 65: 40.7% (13,673 residents)

What is the racial and ethnic makeup of Jefferson County?

The racial and ethnic makeup of Jefferson County is as follows:
  • White: 85.6% (28,727 residents)
  • Black or African American: 0.4% (131 residents)
  • American Indian and Alaska Native: 1.1% (357 residents)
  • Asian: 1.3% (434 residents)
  • Native Hawaiian and Other Pacific Islander: 0.1% (35 residents)
  • Two or More Races: 9.3% (3,108 residents)
  • Other: 2.3% (785 residents)

What percentage of the population in Jefferson County are U.S.-born citizens?

U.S.-born citizens represent 93.1% of the population in Jefferson County.

How many housing units are there in Jefferson County?

There are 19,534 housing units in Jefferson County, reflecting a +0.9% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Jefferson County and what is the average household size?

Jefferson County has a total of 16,340 households, with an average of 2 people in each.

What is the median household income in Jefferson County?

Jefferson County has a median household income of $74,048, representing a +4.1% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Jefferson County?

The employment rate is 93.4% in Jefferson County, with a workforce of 12,285 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 79.4% (9,757 residents)
  • Blue-collar workers: 20.6% (2,528 residents)

Places of employment:
  • Self-employed: 23.6% (2,906 residents)
  • Private companies: 46.2% (5,677 residents)
  • Governmental workers: 17.5% (2,145 residents)
  • Not-for-profit companies: 12.7% (1,557 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025