With 18,478 people, San Juan County is a county in Washington. The median age is 57.0, about 18 years above the US median. The typical home is worth $799,200, having more than doubled since 2000. This is an unusually credentialed place: 54% of adults have a four-year degree. That puts it in the top 3% of US counties for household income. Owners hold 78% of the housing stock.
At a glance
Average income
median household income $84,800, near the US median
US median: $82,259
Older
median age 57.0
US median: 38.9
More educated
54% hold a bachelor's degree
US average: 36%
Less affordable
home values up 53%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about San Juan County
What changed most since 1990
Median age43.4 → 57.0(+13.6 years)US over the same years: +6.0 years
Population10,035 → 18,478(+84%)US over the same years: +35%
White share96.9% → 85.2%(−11.7 pts)US over the same years: −17.8 pts
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)11.5%(139)
US avg: 26.4%
Gulf War (1990s)12.5%(151)
US avg: 24.3%
Vietnam era48.5%(587)
US avg: 33.1%
Korean War7.5%(91)
US avg: 4.5%
World War II1.7%(21)
US avg: 1%
Share of the 1,211 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
San Juan County, decade by decade
San Juan County population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
10,035
$75,069
$407,532
33.5%
7.7
2000
14,077
$79,226
$521,722
40.2%
15.1
2010
15,769
$72,973
$712,956
44.9%
22.8
2020
17,788
$78,483
$648,683
51.7%
35.0
2024
18,478
$84,800
$799,200
53.9%
33.1
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
