2024 presidential election
Mercer Island
HarrisD+53.8
Constituent county margins for Mercer Island, WAOne cell per constituent county, colored by 2024 presidential margin from deep red (Republican) through neutral to deep blue (Democratic), ordered bluest first.
How it voted
Share of the 2024 vote
| Kamala Harris ✓Democratic | 75.1% | 11,716 |
|---|---|---|
| Donald TrumpRepublican | 21.3% | 3,321 |
| OtherAll other candidates | 3.6% | 561 |
D+60R+60
1 counties, each filled by 2024 D-vs-R margin.
presidential history
Presidential margin, 2008–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 2008 | +34.1% |
| 2012 | +27.6% |
| 2016 | +50.5% |
| 2020 | +54.5% |
| 2024 | +53.8% |
DemocraticRepublican
5 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 11,716 | 3,321 | 15,598 | ||
| D | 12,768 | 3,617 | 16,804 | ||
| D | 10,721 | 3,272 | 14,751 | ||
| D | 9,682 | 5,497 | 15,179 | ||
| D | 9,718 | 4,735 | 14,617 |
Demographics
Demographic profile
Demographic Profile
Key indicators compared across containing geographies
| Indicator | Mercer IslandCity | WashingtonState | United StatesNation |
|---|---|---|---|
| Race & Ethnicity | |||
| White | 63.6% | 65.8% | 61.0% |
| Black | 0.9% | 4.0% | 12.2% |
| Asian | 24.5% | 9.8% | 6.0% |
| Two or more races | 10.1% | 12.7% | 12.6% |
| Other race | 0.9% | 7.7% | 8.2% |
| Hispanic or Latino | 2.4% | 14.4% | 19.3% |
| Income & Age | |||
| Median household income | $219,069 | $98,141 | $84,427 |
| Poverty rate | 3.8% | 9.9% | 12.5% |
| Median age | 46.4 | 38.5 | 39.1 |
| Age 18–24 | 8.1% | 8.5% | 9.2% |
| Age 65 and older | 14.0% | 16.7% | 17.2% |
| Education & Language | |||
| Bachelor's degree or higher (25+) | 81.4% | 39.6% | 35.7% |
| Speaks a non-English language at home | 25.6% | 21.4% | 22.3% |
| Chinese (incl. Mandarin & Cantonese) | 9.4% | 1.9% | 1.1% |
| Other Indo-European | 6.0% | 2.0% | 2.0% |
| Korean | 2.4% | 0.7% | 0.3% |
| Other Asian & Pacific Island | 1.9% | 2.1% | 1.1% |
| Ancestry | |||
| Largest ancestry | German 12.0% | German 14.5% | German 12.5% |
| 2nd-largest ancestry | English 11.0% | English 12.1% | English 9.5% |
| 3rd-largest ancestry | Irish 8.6% | Irish 9.8% | Irish 9.4% |
| Religion | |||
| Catholic | 12.5%County context | 10.7% | 18.6% |
| Evangelical Protestant | 15.6%County context | 20.5% | 16.5% |
| Unaffiliated or unclaimed | 60.9%County context | 58.8% | 51.5% |
ACS values are survey estimates and may include margins of error.
Religion data may be available only at county or larger geographies. Sub-county values are labeled when inherited, modeled, or contextual.
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
12.0%
English
11.0%
Irish
8.6%
Italian
3.4%
American
2.5%
Scottish
2.3%
French
2.2%
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: 46.4 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
$219,069
Mercer Island$219,069
Washington$98,141
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
3.8%
Child poverty is below the national average.
Children under 189.7%
Working age (18–64)8.2%
Seniors (65+)10.1%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
74.4%
speak English only
Chinese (incl. Mandarin & Cantonese)9.4%
Other Indo-European6.0%
Korean2.4%
Other Asian & Pacific Island1.9%
Spanish1.4%
Russian, Polish, or other Slavic1.3%
German or other West Germanic1.1%
French (incl. Cajun & Haitian)0.7%
Vietnamese0.7%
Other languages0.4%
Tagalog (incl. Filipino)0.3%
Arabic0.1%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Unaffiliated or not counted60.9%
Source · 2020 US Religion Census. The unaffiliated-or-not-counted share is everyone not claimed as an adherent by any reporting body — uncounted congregations as well as the religiously unaffiliated.
Mercer Island sits in the Pacific Northwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 54.5 points in 2020. Between 2020 and 2024 the city moved 0.6 points toward the Republican candidate; the 2024 margin was 53.8 points.
A population of 25,307, a 64% non-Hispanic-white share, and a median household income of $219,069 describe the city.
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.
Mercer Island, Washington. Akashic. https://akashic.app/city/5345005/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Frequently asked questions
How did Mercer Island, Washington vote in 2024?
In 2024, Mercer Island, Washington voted Democratic by 53.8 points (D+53.8), carried by the Democratic candidate. Out of 15,598 votes cast, 11,716 went Democratic and 3,321 went Republican.
What is Mercer Island, Washington's political typology?
Akashic places Mercer Island, Washington in the "" typology. 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 5 elections in the dataset, the city has voted Democratic 5 times, Republican 0 times, and other 0 times.
How many people live in Mercer Island, Washington?
Mercer Island, Washington has a population of 25,307 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Mercer Island, Washington?
Median household income in Mercer Island, Washington is $219,069 — above the national median of $80,734. The Washington state median is $98,141.
What is the political history of Mercer Island, Washington?
Akashic tracks 5 presidential elections in Mercer Island, Washington from 2008 to 2024. Of those, 5 went Democratic and 0 went Republican. The city's typology — "" — captures where that record, its demographics, and its recent swing place it among American communities.