San Juan County's 2026 population is estimated at 18,794, reflecting a 0.34% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). San Juan County is the 32nd largest county in Washington. The 2010 population was 15,783 and has grown 19.08% since 2010.
Data after 2023 is projected based on recent change
Overall: 57 years
Female: 58 years
Male: 56 years
There are 16,155 adults, (6,656 of whom are seniors) in San Juan County.
Female: 9,346 (50.6%)
Male: 9,132 (49.4%)
The racial composition of San Juan County includes 86.78% White, 3.98% other race, and smaller percentages for Asian, Native American, Native Hawaiian or Pacific Islander, Black or African American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 16,035 | 86.78% |
| Two or more races | 1,257 | 6.8% |
| Other race | 735 | 3.98% |
| Asian | 248 | 1.34% |
| Native American | 111 | 0.6% |
| Native Hawaiian or Pacific Islander | 47 | 0.25% |
| Black or African American | 45 | 0.24% |
San Juan County 's average per capita income is $48,343. Household income levels show a median of $84,800. The poverty rate stands at 11.34%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $116,394 | - |
| Families | $107,269 | $162,484 |
| Households | $84,800 | $131,031 |
| Non Families | $54,257 | $78,393 |
Average Income
Median Household Income
Poverty Rate