San Juan County, Washington Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 32nd-largest in Washington
The population of San Juan County, Washington is 18,266 as of the 2023 American Community Survey, making it the 32nd-largest county in Washington. The median household income is $83,682, the median home value is $726,500, and the median age is 56.7.
The population of San Juan County has grown 18.3% since 2010 (15,783 → 18,668), a +1.21% annualized rate.
18,266
Population
+1.21%
Annual growth
105
People / sq mi
$83,682
Median Income
$726,500
Median Home Value
San Juan County covers 174 sq mi of land at 105.0 people per square mile.
About San Juan County, WA
Housing cost is the defining feature of San Juan County: the median home is valued at $726,500. San Juan County is a county in Washington with a population of 18,266. It ranks #32 among counties in Washington by population.
Median household income is $83,682, above the US median of $78,538. About 7.8% of residents live below the federal poverty level, below the national 12.4%. Housing is expensive: the median home is worth $726,500, with typical rent around $1,413.
San Juan County is among the best-educated US counties: 53.4% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. Working from home is common here: 20.0% of workers do so, above the national 14.0%, and the average commute runs about 16 minutes each way.
High housing values reframe the income picture in San Juan County — even solid earnings stretch less against home prices and rents at this level.
San Juan County Population History (2010-2024)
The county of San Juan County had a population of 15,783 in 2010 and 18,668 in 2024, a 18.3% growth over 14 years. The peak was 18,668 in 2024. Average annual growth rate: 1.21%.
18,668
Population (2024)
15,783
Population (2010)
18,668
Peak (2024)
1.21%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 15,783 |
| 2011 | 15,807 |
| 2012 | 15,806 |
| 2013 | 15,867 |
| 2014 | 15,970 |
| 2015 | 16,155 |
| 2016 | 16,256 |
| 2017 | 16,674 |
| 2018 | 16,991 |
| 2019 | 17,352 |
| 2020 | 17,826 |
| 2021 | 18,623 |
| 2022 | 18,666 |
| 2023 | 18,605 |
| 2024 | 18,668 |
Race & Ethnicity
| White | 88.3% |
| Black or African American | 0.3% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.4% |
| Two or More Races | 0.0% |
Age & Sex
56.7
Median Age
50.8%
Female
49.2%
Male
35.0%
Age 65+
Age Distribution
Children (under 15): 10.3% · Seniors (65+): 35.0%
Income & Poverty
| Median household income | $83,682$-11,270 vs state |
| Mean household income | $129,398 |
| Per-capita income | $63,173 |
| Poverty rate | 7.8%+1.4% vs state |
| Unemployment rate | 1.6% |
| Employment-to-population | 51.6% |
Top Industries by Employment
The largest employment sector in San Juan County is professional & business services, accounting for 16.4% of workers.
How residents commute
0.9%
Drive alone
5.9%
Carpool
62.4%
Public transit
20.0%
Work from home
16.2 min
Avg commute
Housing
$726,500+$206,700 vs state
Median home value
$1,413
Median rent
77.8%
Homeownership rate
13,951
Total housing units
64.0%
Occupied
36.0%
Vacant
22.2%
Renter-occupied
Social & access
93.2%
With health insurance
97.9%
With broadband internet
57.1%
Foreign-born
8.0%
Veterans (18+)
11.9%
With a disability
93.4%
Speak language other than English at home
Education
95.5%
High School+
53.4%
Bachelor's+
Largest cities in Washington
Other counties in Washington
Part of Washington
Metro areas in Washington
County rankings
Frequently Asked Questions
San Juan County, Washington has a population of 18,266 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 32nd-largest county in Washington. Population density is 105 people per square mile.
The population of San Juan County has grown 18.3% since 2010 (15,783 → 18,668), a +1.21% annualized rate.
The median household income in San Juan County, Washington is $83,682, with mean (average) household income of $129,398 and per-capita income of $63,173. 7.8% of residents live below the federal poverty level.
In San Juan County, the largest racial and ethnic groups are White (88.3%), Hispanic or Latino (2.4%), Black or African American (0.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in San Juan County, Washington is 56.7 years. Residents are 50.8% female and 49.2% male.
The median home value in San Juan County is $726,500 and median monthly rent is $1,413. 77.8% of occupied housing units are owner-occupied. The county has 13,951 total housing units, 36.0% of which are vacant.
The largest employment sector in San Juan County, Washington is professional, scientific, and management services, employing 16.4% of workers. The unemployment rate is 1.6%.
Seattle is among the largest cities associated with San Juan County, Washington, with a population of 741,440.
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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.