Demographics of Snohomish County, Washington

Snohomish County, Washington had 870,656 people on July 1, 2025, by the Census Bureau’s estimate: +40,755 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.

Snohomish County, in four figures

870,656
Population: July 1, 2025, Vintage 2025 estimate.; +4.9%
Change since July 2020: +40,755 people.; 38.6 ±0.2
Median age: ACS 2020–⁠2024.; $111,246 ±$1,305
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.

Snohomish County, Washington's population grew 4.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Snohomish 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).

Source: The Census Bureau

About this chart

The figures

Snohomish County, Washington's population grew 4.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Snohomish 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	829,901	100.0	100.0
2021	836,262	100.8	100.2
2022	840,860	101.3	100.7
2023	848,363	102.2	101.6
2024	861,070	103.8	102.5
2025	870,656	104.9	103.1

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Population of Snohomish 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	829,901	+1,954	+846	+101	+789
2021	836,262	+6,361	+3,270	+1,491	+939
2022	840,860	+4,598	+3,214	+4,278	−2,228
2023	848,363	+7,503	+3,388	+6,944	−2,659
2024	861,070	+12,707	+3,776	+9,129	−172
2025	870,656	+9,586	+3,698	+6,325	−525

Age, 2020–2024

The median age is 38.6 ±0.2: for men 38.0 ±0.2 and for women 39.1 ±0.2. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Snohomish County by age, ACS 2020–2024
Age	People	Share	Washington	United States
Under 5	50,557 ±114	6.0% ±<0.1	5.5% ±<0.1	5.6% ±<0.1
5 to 17	136,299 ±1,954	16.1% ±0.2	15.8% ±0.1	16.3% ±<0.1
18 to 24	61,136 ±1,354	7.2% ±0.2	8.5% ±0.1	9.1% ±<0.1
25 to 44	257,693 ±2,312	30.5% ±0.3	29.5% ±0.1	26.9% ±<0.1
45 to 64	213,982 ±2,094	25.3% ±0.2	24.0% ±0.1	24.8% ±<0.1
65 and over	124,763 ±2,063	14.8% ±0.2	16.6% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $111,246 ±$1,305, and income per person $54,628 ±$634, 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 Snohomish County by income, ACS 2020–2024
Household income	Households	Share	Washington	United States
Under $25,000	28,570 ±1,400	9.0% ±0.4	11.1% ±0.2	14.6% ±<0.1
$25,000 to $49,999	33,427 ±1,583	10.6% ±0.5	13.2% ±0.2	16.7% ±<0.1
$50,000 to $74,999	41,251 ±1,731	13.0% ±0.5	14.1% ±0.2	15.5% ±<0.1
$75,000 to $99,999	38,174 ±1,510	12.1% ±0.5	12.4% ±0.1	12.6% ±<0.1
$100,000 to $149,999	63,992 ±1,977	20.2% ±0.6	19.2% ±0.2	17.5% ±<0.1
$150,000 to $199,999	41,905 ±1,295	13.3% ±0.4	11.4% ±0.1	9.6% ±<0.1
$200,000 or more	68,893 ±1,706	21.8% ±0.5	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 Snohomish County by age, ACS 2020–2024
Age	Below poverty	Rate	Washington	United States
All ages	67,143 ±3,371	8.0% ±0.4	9.9% ±0.2	12.5% ±0.1
Under 18	16,981 ±1,398	9.2% ±0.7	11.6% ±0.3	16.1% ±0.1
18 to 59	34,488 ±1,840	7.3% ±0.4	9.5% ±0.2	11.6% ±0.1
60 and over	15,674 ±1,048	8.8% ±0.6	9.3% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Snohomish County, ACS 2020–2024
Measure	Snohomish County	Washington	United States
Housing units	331,530 ±231	3,306,620 ±517	143,775,355 ±10,234
Occupied	95.4% ±0.3	92.7% ±0.2	89.9% ±0.1
Vacant	4.6% ±0.3	7.3% ±0.2	10.1% ±0.1
Owner occupied	68.2% ±0.6	63.8% ±0.3	65.2% ±0.3
Renter occupied	31.8% ±0.6	36.2% ±0.2	34.8% ±0.1
Median home value	$696,000 ±$4,737	$564,600 ±$1,940	$332,700 ±$236
Median gross rent	$1,949 ±$22	$1,760 ±$7	$1,413 ±$2
Median year built	1990 ±1	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 Snohomish County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Washington	United States
Hispanic or Latino	102,350 ±0	12.1% ±<0.1	14.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	523,347 ±1,734	62.0% ±0.2	63.1% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	30,238 ±1,093	3.6% ±0.1	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	114,492 ±1,662	13.6% ±0.2	9.7% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	5,376 ±524	0.6% ±0.1	0.8% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	4,355 ±439	0.5% ±0.1	0.7% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	5,728 ±1,197	0.7% ±0.1	0.6% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	58,544 ±2,589	6.9% ±0.3	6.8% ±0.1	4.3% ±<0.1

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 Snohomish County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Washington	United States
Born in the state	416,397 ±3,751	49.3% ±0.4	46.4% ±0.2	57.3% ±<0.1
Born in another state	251,035 ±4,244	29.7% ±0.5	36.2% ±0.2	26.9% ±<0.1
Born a citizen outside the states	13,983 ±795	1.7% ±0.1	1.9% ±<0.1	1.7% ±<0.1
Born abroad	163,015 ±3,002	19.3% ±0.4	15.4% ±0.1	14.1% ±<0.1
Naturalized citizens	82,907 ±2,626	9.8% ±0.3	7.5% ±0.1	7.4% ±<0.1
Not citizens	80,108 ±2,804	9.5% ±0.3	7.9% ±0.1	6.8% ±<0.1

Snohomish County among the counties of Washington

3rd of 39 by population, July 2025. Every one is listed on the Washington page.

Counties of Washington near Snohomish County in population, July 2025
County	July 2025	Change since 2020
King County	2,344,939	+3.1%
Pierce County	946,288	+2.5%
Snohomish County	870,656	+4.9%
Spokane County	558,344	+3.2%
Clark County	532,119	+5.3%
Thurston County	304,261	+2.8%
Kitsap County	283,374	+2.7%
Yakima County	259,185	+1.0%

Elsewhere on the site

Rankings this appears in

No. 3 Counties by population in Washington
No. 16 Counties by population growth in Washington
No. 42 Counties by median rent
No. 46 Counties by median home value
No. 62 Counties by median household income
No. 74 Counties by population

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

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026