San Juan County, Washington: Realigning Affluent Suburb county. In 2024, voted D+51%. Republican peak: R+59 in 1924.
Key facts
- 2024 presidential margin
- D+51MIT Election Lab
- Political typology
- Realigning Affluent SuburbAkashic typology
- Population
- 18,4782024 5-year
- Median household income
- $84,8002024 5-year
- White (non-Hispanic)
- 86.8%2024 5-year
- Black
- 0.2%2024 5-year
- Hispanic / Latino
- 7.6%2024 5-year
- Peak Democratic margin
- D+51 in 2020MIT Election Lab
- Peak Republican margin
- R+59 in 1924MIT Election Lab
- Most similar
- Boulder County, CO · similarity 1.00
2024 results by precinct
2024 precinct map of San Juan CountyPrecinct-level 2024 presidential results for San Juan County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | −19.2% |
| 1896 | −17.0% |
| 1900 | −26.3% |
| 1904 | −57.3% |
| 1908 | −45.7% |
| 1912 | −2.4% |
| 1916 | +5.6% |
| 1920 | −51.0% |
| 1924 | −59.0% |
| 1928 | −33.9% |
| 1932 | +11.9% |
| 1936 | +5.3% |
| 1940 | +3.1% |
| 1944 | −4.4% |
| 1948 | −15.6% |
| 1952 | −29.1% |
| 1956 | −30.8% |
| 1960 | −28.0% |
| 1964 | +3.8% |
| 1968 | −24.4% |
| 1972 | −31.5% |
| 1976 | −14.3% |
| 1980 | −13.9% |
| 1984 | −7.0% |
| 1988 | +6.0% |
| 1992 | +20.4% |
| 1996 | +15.5% |
| 2000 | +16.9% |
| 2004 | +32.7% |
| 2008 | +41.9% |
| 2012 | +37.5% |
| 2016 | +40.3% |
| 2020 | +50.5% |
| 2024 | +51.1% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 9,539 | 2,890 | 13,006 | ||
| D | 9,725 | 3,057 | 13,197 | ||
| D | 7,172 | 2,688 | 11,134 | ||
| D | 7,125 | 3,111 | 10,692 | ||
| D | 7,374 | 2,958 | 10,531 | ||
| D | 6,589 | 3,290 | 10,104 | ||
| D | 4,426 | 3,005 | 8,424 | ||
| D | 3,663 | 2,523 | 7,354 | ||
| D | 3,353 | 1,901 | 7,117 | ||
| D | 3,008 | 2,660 | 5,814 | ||
| R | 2,514 | 2,900 | 5,526 | ||
| R | 1,666 | 2,363 | 5,031 | ||
| R | 1,467 | 1,998 | 3,722 | ||
| R | 906 | 1,786 | 2,795 | ||
| R | 685 | 1,164 | 1,963 | ||
| D | 906 | 839 | 1,750 | ||
| R | 624 | 1,112 | 1,740 | ||
| R | 584 | 1,105 | 1,693 | ||
| R | 619 | 1,133 | 1,766 | ||
| R | 636 | 881 | 1,575 | ||
| R | 644 | 703 | 1,354 | ||
| D | 860 | 808 | 1,675 | ||
| D | 775 | 690 | 1,595 | ||
| D | 786 | 607 | 1,501 | ||
| R | 400 | 814 | 1,220 | ||
| R | 86 | 744 | 1,116 | ||
| R | 196 | 833 | 1,250 | ||
| D | 669 | 591 | 1,395 | ||
| O | 311 | 341 | 1,239 | ||
| R | 178 | 581 | 881 | ||
| R | 113 | 554 | 770 | ||
| R | 245 | 428 | 696 | ||
| R | 291 | 411 | 705 | ||
| R | 226 | 348 | 634 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
English
19.4%
German
17.3%
Irish
13.3%
Scottish
5.8%
Italian
3.6%
French
2.9%
American
2.6%
Sample size too small to break out by ancestry reliably.
Multiple ancestry combinations reported; no single grouping above 1%.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 57.0 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$84,800
San Juan County ranks in the top 25% of US counties.
San Juan County$84,800
Washington$98,141
United States$80,734
San Juan County ranks in the top 25% of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
11.3%
Child poverty is below the national average.
Children under 1814.3%
Working age (18–64)11.3%
Seniors (65+)9.2%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
93.2%
speak English only
Spanish3.5%
Other Indo-European2.2%
Asian & Pacific Islander0.8%
Other languages0.3%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 76.3% of residents not counted as adherents by any reporting body.
San Juan County, reachable only by ferry or small plane, combines a tiny year-round population with a heavily educated, affluent resident base that has produced some of the most lopsided presidential margins in the Pacific Northwest.
Once reliably Republican — a margin of fifty-nine points in 1924 at its widest — San Juan County has trended Democratic. Between 2020 and 2024 the county moved one point toward the Democratic candidate; the 2024 margin was fifty-one points.
A median household income of $84,800 — among the higher at this geographic scale — and a population of 18,478 describe the county. The county's voting pattern over the last decade is most similar to that of Boulder County and Charlottesville city.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
San Juan County, Washington. Akashic. https://akashic.app/county/53055/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Frequently asked questions
How did San Juan County, Washington vote in 2024?
In 2024, San Juan County, Washington voted Democratic by 51.1 points (D+51), carried by the Democratic candidate. Out of 13,006 votes cast, 9,539 went Democratic and 2,890 went Republican.
What is San Juan County, Washington's political typology?
Akashic places San Juan County, Washington in the "Realigning Affluent Suburb" typology — College-educated, affluent suburbs — the one bloc moving toward the Democratic Party. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 15 times, Republican 18 times, and other 1 times.
When did San Juan County, Washington last vote Republican?
The most recent presidential election in which San Juan County, Washington voted Republican was 1984.
How many people live in San Juan County, Washington?
San Juan County, Washington has a population of 18,478 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in San Juan County, Washington?
Median household income in San Juan County, Washington is $84,800 — above the national median of $80,734. The Washington state median is $98,141.
What is the political history of San Juan County, Washington?
Akashic tracks 38 presidential elections in San Juan County, Washington from 1876 to 2024. Of those, 15 went Democratic and 18 went Republican. The county's typology — "Realigning Affluent Suburb" — captures where that record, its demographics, and its recent swing place it among American communities.