Demographics of Jefferson County, Washington

Jefferson County, Washington had 33,970 people on July 1, 2025, by the Census Bureau’s estimate: +906 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Jefferson County, in four figures

33,970
Population: July 1, 2025, Vintage 2025 estimate.; +2.7%
Change since July 2020: +906 people.; 59.8 ±0.4
Median age: ACS 2020–⁠2024.; $74,048 ±$4,031
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Jefferson County, Washington's population grew 2.7% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Jefferson County, Washington's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Jefferson County, Washington's population grew 2.7% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Jefferson County, Washington's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	33,064	100.0	100.0
2021	33,558	101.5	100.2
2022	33,597	101.6	100.7
2023	33,715	102.0	101.6
2024	33,891	102.5	102.5
2025	33,970	102.7	103.1

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Population of Jefferson County, Washington on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	33,064	+92	−61	0	+177
2021	33,558	+494	−286	+20	+804
2022	33,597	+39	−258	+30	+265
2023	33,715	+118	−287	+37	+363
2024	33,891	+176	−271	+47	+401
2025	33,970	+79	−269	+11	+344

Age, 2020–2024

The median age is 59.8 ±0.4: for men 57.9 ±0.8 and for women 61.1 ±0.6. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Jefferson County by age, ACS 2020–2024
Age	People	Share	Washington	United States
Under 5	808 ±66	2.4% ±0.2	5.5% ±<0.1	5.6% ±<0.1
5 to 17	2,939 ±231	8.8% ±0.7	15.8% ±0.1	16.3% ±<0.1
18 to 24	1,278 ±190	3.8% ±0.6	8.5% ±0.1	9.1% ±<0.1
25 to 44	6,001 ±349	17.9% ±1.0	29.5% ±0.1	26.9% ±<0.1
45 to 64	8,878 ±512	26.4% ±1.5	24.0% ±0.1	24.8% ±<0.1
65 and over	13,673 ±616	40.7% ±1.8	16.6% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $74,048 ±$4,031, and income per person $51,695 ±$3,167, in 2024 dollars. The median is $98,141 ±$414 in Washington and $80,734 ±$166 in the United States.

Households by income

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Households in Jefferson County by income, ACS 2020–2024
Household income	Households	Share	Washington	United States
Under $25,000	2,616 ±337	16.0% ±2.0	11.1% ±0.2	14.6% ±<0.1
$25,000 to $49,999	2,886 ±447	17.7% ±2.7	13.2% ±0.2	16.7% ±<0.1
$50,000 to $74,999	2,780 ±365	17.0% ±2.2	14.1% ±0.2	15.5% ±<0.1
$75,000 to $99,999	1,933 ±258	11.8% ±1.6	12.4% ±0.1	12.6% ±<0.1
$100,000 to $149,999	2,919 ±374	17.9% ±2.2	19.2% ±0.2	17.5% ±<0.1
$150,000 to $199,999	1,461 ±219	8.9% ±1.3	11.4% ±0.1	9.6% ±<0.1
$200,000 or more	1,745 ±285	10.7% ±1.7	18.5% ±0.2	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Jefferson County by age, ACS 2020–2024
Age	Below poverty	Rate	Washington	United States
All ages	3,669 ±513	11.1% ±1.6	9.9% ±0.2	12.5% ±0.1
Under 18	501 ±137	13.7% ±3.5	11.6% ±0.3	16.1% ±0.1
18 to 59	1,659 ±308	12.8% ±2.3	9.5% ±0.2	11.6% ±0.1
60 and over	1,509 ±286	9.1% ±1.7	9.3% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Jefferson County, ACS 2020–2024
Measure	Jefferson County	Washington	United States
Housing units	19,534 ±48	3,306,620 ±517	143,775,355 ±10,234
Occupied	83.6% ±2.1	92.7% ±0.2	89.9% ±0.1
Vacant	16.4% ±2.1	7.3% ±0.2	10.1% ±0.1
Owner occupied	79.0% ±2.0	63.8% ±0.3	65.2% ±0.3
Renter occupied	21.0% ±2.4	36.2% ±0.2	34.8% ±0.1
Median home value	$535,000 ±$27,178	$564,600 ±$1,940	$332,700 ±$236
Median gross rent	$1,522 ±$120	$1,760 ±$7	$1,413 ±$2
Median year built	1988 ±2	1985 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Jefferson County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Washington	United States
Hispanic or Latino	1,480 ±0	4.4% ±<0.1	14.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	28,394 ±373	84.6% ±1.1	63.1% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	55 to 175	0.2% to 0.5%	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	434 ±85	1.3% ±0.3	9.7% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	351 ±110	1.0% ±0.3	0.8% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 71	0% to 0.2%	0.7% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	202 to 936	0.6% to 2.8%	0.6% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	2,199 ±221	6.5% ±0.7	6.8% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Jefferson County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Washington	United States
Born in the state	12,951 ±607	38.6% ±1.8	46.4% ±0.2	57.3% ±<0.1
Born in another state	18,302 ±670	54.5% ±2.0	36.2% ±0.2	26.9% ±<0.1
Born a citizen outside the states	706 ±229	2.1% ±0.7	1.9% ±<0.1	1.7% ±<0.1
Born abroad	1,618 ±331	4.8% ±1.0	15.4% ±0.1	14.1% ±<0.1
Naturalized citizens	970 ±206	2.9% ±0.6	7.5% ±0.1	7.4% ±<0.1
Not citizens	648 ±236	1.9% ±0.7	7.9% ±0.1	6.8% ±<0.1

Jefferson County among the counties of Washington

27th of 39 by population, July 2025. Every one is listed on the Washington page.

Counties of Washington near Jefferson County in population, July 2025
County	July 2025	Change since 2020
Stevens County	49,668	+6.6%
Kittitas County	48,803	+4.2%
Whitman County	48,512	+1.5%
Douglas County	46,473	+8.0%
Okanogan County	45,230	+7.3%
Jefferson County	33,970	+2.7%
Pacific County	24,357	+3.6%
Klickitat County	24,331	+6.6%
Asotin County	22,545	+1.0%
Adams County	21,488	+4.3%
San Juan County	18,577	+4.2%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026