Demographics of San Juan County, Washington

San Juan County, Washington had 18,577 people on July 1, 2025, by the Census Bureau’s estimate: +752 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.

San Juan County, in four figures

18,577
Population: July 1, 2025, Vintage 2025 estimate.; +4.2%
Change since July 2020: +752 people.; 57.0 ±0.4
Median age: ACS 2020–⁠2024.; $84,800 ±$5,910
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.

San Juan County, Washington's population grew 4.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of San Juan 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

San Juan County, Washington's population grew 4.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of San Juan 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	17,825	100.0	100.0
2021	18,629	104.5	100.2
2022	18,668	104.7	100.7
2023	18,563	104.1	101.6
2024	18,556	104.1	102.5
2025	18,577	104.2	103.1

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Population of San Juan 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	17,825	+39	−8	0	+53
2021	18,629	+804	−36	+8	+894
2022	18,668	+39	−53	+22	+69
2023	18,563	−105	−42	+25	−93
2024	18,556	−7	−81	+57	+19
2025	18,577	+21	−84	+36	+70

Age, 2020–2024

The median age is 57.0 ±0.4: for men 56.0 ±0.5 and for women 58.0 ±0.4. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in San Juan County by age, ACS 2020–2024
Age	People	Share	Washington	United States
Under 5	466 ±35	2.5% ±0.2	5.5% ±<0.1	5.6% ±<0.1
5 to 17	1,857 ±102	10.0% ±0.6	15.8% ±0.1	16.3% ±<0.1
18 to 24	815 ±94	4.4% ±0.5	8.5% ±0.1	9.1% ±<0.1
25 to 44	3,526 ±157	19.1% ±0.8	29.5% ±0.1	26.9% ±<0.1
45 to 64	5,158 ±167	27.9% ±0.9	24.0% ±0.1	24.8% ±<0.1
65 and over	6,656 ±227	36.0% ±1.2	16.6% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $84,800 ±$5,910, and income per person $63,950 ±$3,457, 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 San Juan County by income, ACS 2020–2024
Household income	Households	Share	Washington	United States
Under $25,000	1,329 ±156	14.7% ±1.7	11.1% ±0.2	14.6% ±<0.1
$25,000 to $49,999	1,429 ±152	15.9% ±1.6	13.2% ±0.2	16.7% ±<0.1
$50,000 to $74,999	1,302 ±122	14.4% ±1.3	14.1% ±0.2	15.5% ±<0.1
$75,000 to $99,999	1,058 ±118	11.7% ±1.3	12.4% ±0.1	12.6% ±<0.1
$100,000 to $149,999	1,625 ±170	18.0% ±1.8	19.2% ±0.2	17.5% ±<0.1
$150,000 to $199,999	914 ±100	10.1% ±1.1	11.4% ±0.1	9.6% ±<0.1
$200,000 or more	1,358 ±103	15.1% ±1.1	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 San Juan County by age, ACS 2020–2024
Age	Below poverty	Rate	Washington	United States
All ages	2,072 ±255	11.3% ±1.4	9.9% ±0.2	12.5% ±0.1
Under 18	320 ±77	14.3% ±3.3	11.6% ±0.3	16.1% ±0.1
18 to 59	956 ±129	12.5% ±1.6	9.5% ±0.2	11.6% ±0.1
60 and over	796 ±115	9.5% ±1.3	9.3% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in San Juan County, ACS 2020–2024
Measure	San Juan County	Washington	United States
Housing units	13,990 ±81	3,306,620 ±517	143,775,355 ±10,234
Occupied	64.4% ±1.6	92.7% ±0.2	89.9% ±0.1
Vacant	35.6% ±1.5	7.3% ±0.2	10.1% ±0.1
Owner occupied	78.0% ±0.7	63.8% ±0.3	65.2% ±0.3
Renter occupied	22.0% ±1.6	36.2% ±0.2	34.8% ±0.1
Median home value	$799,200 ±$22,896	$564,600 ±$1,940	$332,700 ±$236
Median gross rent	$1,512 ±$112	$1,760 ±$7	$1,413 ±$2
Median year built	1988 ±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 San Juan County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Washington	United States
Hispanic or Latino	1,409 ±0	7.6% ±<0.1	14.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	15,743 ±89	85.2% ±0.5	63.1% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	20 to 70	0.1% to 0.4%	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	248 ±39	1.3% ±0.2	9.7% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	78 ±27	0.4% ±0.1	0.8% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	43 ±7	0.2% ±<0.1	0.7% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	29 to 101	0.2% to 0.5%	0.6% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	847 ±102	4.6% ±0.6	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 San Juan County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Washington	United States
Born in the state	6,227 ±235	33.7% ±1.3	46.4% ±0.2	57.3% ±<0.1
Born in another state	10,641 ±242	57.6% ±1.3	36.2% ±0.2	26.9% ±<0.1
Born a citizen outside the states	321 ±63	1.7% ±0.3	1.9% ±<0.1	1.7% ±<0.1
Born abroad	1,289 ±152	7.0% ±0.8	15.4% ±0.1	14.1% ±<0.1
Naturalized citizens	722 ±105	3.9% ±0.6	7.5% ±0.1	7.4% ±<0.1
Not citizens	567 ±110	3.1% ±0.6	7.9% ±0.1	6.8% ±<0.1

San Juan County among the counties of Washington

32nd of 39 by population, July 2025. Every one is listed on the Washington page.

Counties of Washington near San Juan County in population, July 2025
County	July 2025	Change since 2020
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%
Pend Oreille County	14,457	+7.0%
Skamania County	12,669	+5.2%
Lincoln County	11,982	+9.7%
Ferry County	7,517	+4.4%
Wahkiakum County	4,873	+9.6%

Elsewhere on the site

Rankings this appears in

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