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CITY

Mercer Island

Washington · 25,422 residents (2025 est.) · 6.383 sq mi
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Part of the Seattle metro area
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Notable rankings
#5Most expensive homesof 6,786$2,000,001#69Most educatedof 6,82681.4%#72Most work-from-homeof 6,82638.6%#111Highest median household incomeof 6,818$219,069
The short version

Mercer Island is significantly wealthier than the US average, with a median household income of $219,069. Population has held roughly steady since 2000. 81% of adults hold a bachelor's degree or higher, well above the national rate of 36%. Median home value has more than tripled since 2000, reaching $2,000,001. With a median age of 46.4, the population is older than the US median of 38.9. It ranks in the top 1% of US cities for household income.

At a glance
Wealthier
above the US median
US median: $82,259
Older
median age 46.4
US median: 38.9
More educated
81% hold a bachelor's degree
US average: 36%
Less affordable
home values up 100%, inflation adjusted
US median home: $376,019
Section 01

Population & growth

Total population
25,307
+15%since 2000
from 22,036 in 2000
1990 – 2025
Population density
3,965 / sq mi
+6%since 2009
from 3,727 / sq mi in 2009
US average: 281
Median age
46.4
+5%since 2000
from 44.3 in 2000
US average: 38.9

PEP 2025 EST:25,422 residents (Census Bureau Vintage 2025, released March 2026)

Population, 1990 – 2024
20K22K23K25K26K1990201020202024Mercer Island
202425K
1990201020202024
Age distribution, 2024
Under 53.3%(847)
US avg: 5.6%
5 to 96.2%(1,572)
US avg: 6%
10 to 146.2%(1,578)
US avg: 6.4%
15 to 198.3%(2,089)
US avg: 6.6%
20 to 243.9%(991)
US avg: 6.5%
25 to 348.4%(2,138)
US avg: 13.7%
35 to 4411.9%(3,009)
US avg: 13.2%
45 to 5415.6%(3,939)
US avg: 12.2%
55 to 6414%(3,534)
US avg: 12.7%
65 to 7410.6%(2,675)
US avg: 10.2%
75 to 846.7%(1,702)
US avg: 5.1%
85 and over4.9%(1,233)
US avg: 1.9%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02

Income & economy

Median household income
$219,069
+31%inflation adjusted, since 2000
from $91,904 in 2000
US average: $82,259
1990 – 2024
Per capita income
$128,615
+139%since 2000
from $53,799 in 2000
US average: $44,673
Households earning $100K+
78.1%
+10.2 ptssince 2009
from 67.9% in 2009
US average: 53.3%
Poverty rate
3.8%
+0.6 ptssince 2000
from 3.2% in 2000
US average: 12.5%
Income inequality (Gini)
0.512
+1%since 2010
from 0.505 in 2010
US average: 0.476
Workforce by industry, 2024
Other services11.9%
US avg: 6.7%
Information8.7%
US avg: 10.8%
Arts, entertainment, food6.8%
US avg: 1.9%
Public administration6.5%
US avg: 4.8%
Retail trade4.3%
US avg: 9.9%
Finance & insurance3.1%
US avg: 5.9%
Professional, scientific, technical2.5%
US avg: 5.1%
Wholesale trade1.7%
US avg: 6.9%
Transportation & warehousing1.6%
US avg: 2.2%
Education & health services0.5%
US avg: 0.9%
Agriculture, forestry, fishing0.3%
US avg: 1.6%
Manufacturing0.2%
US avg: 0.4%
Construction0.1%
US avg: 1.2%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 03

Housing

Median home value
$2,000,001
+100%inflation adjusted, since 2000
from $548,300 in 2000
US average: $376,019
1990 – 2024
Median gross rent
$2,502
+35%inflation adjusted, since 2000
from $1,014 in 2000
US average: $1,442
Owner-occupied
67.0%
−13.5 ptssince 2000
from 80.5% in 2000
33.0% rent
Vacancy rate
5.1%
+1.2 ptssince 2009
from 3.9% in 2009
US average: 10.0%
Owner cost-burdened
23.6%
−2.5 ptssince 2009
from 26.1% in 2009
US average: 22.9%
Renter cost-burdened
42.7%
+0.6 ptssince 2009
from 42.2% in 2009
US average: 47.4%
Afford Score
9.1
+22%since 2009
from 7.5 in 2009
2009 – 2024
Our index: median home value divided by median household income. Lower is more affordable.
Gentrification Score
71
Our index, 0 to 100. Higher means faster recent growth in incomes, home values, and college degrees.
RELATED:See current rent listings in Mercer Island on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic82.8%(18,249)
Black1.1%(250)
Hispanic / Latino1.9%(410)
Asian11.8%(2,607)
Other0%
2024
White, non-Hispanic63.3%(16,021)
Black0.9%(216)
Hispanic / Latino2.4%(615)
Asian24.4%(6,175)
Other9%(2,280)
Diversity Score
66
+51%since 2009
from 44 in 2009
2009 – 2024
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
Section 04 · Origins

Detailed origins & ancestry

Hispanic origin
Mexican1%(257)
Spaniard0.4%(93)
Puerto Rican0.1%(36)
Argentine0.1%(33)
Peruvian0.1%(33)
Costa Rican0.1%(17)
Venezuelan0.1%(17)
Cuban0%(7)
+ 2 more hispanic origin groups with data
Asian origin
Chinese10.7%(2,704)
Asian Indian3.7%(943)
Korean3.4%(855)
Japanese2.5%(639)
Vietnamese1.1%(281)
Taiwanese0.7%(173)
Filipino0.5%(122)
Thai0.3%(72)
Pakistani0.1%(33)
Pacific Islander origin
Ancestry
English14.3%(3,622)
German14.2%(3,591)
Irish9%(2,289)
Italian4%(1,014)
Norwegian3.1%(781)
Polish3%(754)
Swedish2.8%(712)
Scottish2.7%(683)
American2.7%(680)
Russian2.2%(545)
French2.1%(523)
Dutch1.4%(364)
+ 36 more ancestry groups with data
British1.4%(352)
Scotch-Irish1.3%(335)
Swiss0.9%(231)
Iranian0.8%(199)
Ukrainian0.8%(197)
Turkish0.7%(182)
Greek0.7%(173)
Lithuanian0.7%(165)
Danish0.6%(156)
Hungarian0.6%(147)
Canadian0.5%(136)
Welsh0.5%(133)
Austrian0.5%(120)
Israeli0.5%(115)
Finnish0.4%(109)
Arab0.4%(98)
Brazilian0.3%(81)
Romanian0.3%(67)
Armenian0.2%(63)
Bulgarian0.2%(63)
Nigerian0.2%(62)
Latvian0.2%(56)
Czech0.2%(47)
Egyptian0.2%(46)
Belgian0.2%(40)
Guyanese0.1%(33)
Portuguese0.1%(28)
Slovak0.1%(23)
Slovene0.1%(21)
Croatian0.1%(13)
Haitian0%(10)
Serbian0%(8)
RANKED:Largest English population · Largest German population · Largest Chinese population · Largest Irish population · Largest Italian population
Section 05

Education

Bachelor's degree or higher
81.4%
+12.3 ptssince 2000
from 69.1% in 2000
US average: 35.6%
High school or higher
98.4%
+0.7 ptssince 2000
from 97.7% in 2000
US average: 89.6%
Graduate degree
44.7%
+13.1 ptssince 2000
from 31.6% in 2000
US average: 14.0%
Section 06

Commute & transportation

Average commute
23.6 min
+76%since 2000
from 13.4 min in 2000
US average: 26.5
Drive alone to work
51.7%
−21.5 ptssince 2009
from 73.2% in 2009
US average: 68.9%
Carpooled to work
3.8%
−2.8 ptssince 2009
from 6.6% in 2009
US average: 8.5%
Public transit
3.1%
−2.7 ptssince 2009
from 5.8% in 2009
US average: 3.2%
Worked from home
38.6%
+27.8 ptssince 2009
from 10.8% in 2009
US average: 15.0%
Walked to work
1.6%
−0.3 ptssince 2009
from 1.9% in 2009
US average: 2.4%
Biked to work
0.1%
−0.7 ptssince 2009
from 0.8% in 2009
US average: 0.4%
No vehicle available
5.7%
+1.7 ptssince 2009
from 4.1% in 2009
US average: 8.3%
Section 07

Work & employment

Unemployment rate
3.0%
−1.2 ptssince 2011
from 4.2% in 2011
US average: 5.2%
Labor force participation
60.3%
+0.1 ptssince 2011
from 60.2% in 2011
US average: 63.5%
Self-employed
11.1%
+0.5 ptssince 2009
from 10.6% in 2009
US average: 13.1%
Management & professional
74.6%
−11.7 ptssince 2009
from 86.3% in 2009
US average: 42.5%
Section 08

People & community

Male
47.6%
−1.7 ptssince 2009
from 49.3% in 2009
Female
52.4%
+1.7 ptssince 2009
from 50.7% in 2009
Foreign born
26.4%
+10.8 ptssince 2009
from 15.6% in 2009
US average: 14.1%
Veterans
4.6%
−42.8 ptssince 2009
from 47.5% in 2009
US average: 6.2%
With a disability
9.2%
+1.2 ptssince 2012
from 8.0% in 2012
US average: 13.3%
Uninsured
1.2%
−95.8 ptssince 2013
from 97.0% in 2013
US average: 8.4%
Broadband at home
94.5%
+4.1 ptssince 2017
from 90.4% in 2017
US average: 91.0%
English only at home
74.4%
−7.1 ptssince 2016
from 81.5% in 2016
US average: 77.7%
Spanish at home
1.4%
−0.4 ptssince 2016
from 1.8% in 2016
US average: 13.6%
Marital status
Men 15+
Never married26.5%(2,697)
Married66.5%(6,758)
Widowed2.7%(270)
Divorced4.3%(442)
Women 15+
Never married22%(2,452)
Married60.4%(6,731)
Widowed8.2%(912)
Divorced9.4%(1,048)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
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MERCER ISLAND VS
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MERCER ISLAND VS
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Frequently asked

How many people live in Mercer Island, Washington?

Mercer Island, Washington has about 25,307 residents according to the 2024 American Community Survey.

What is the median household income in Mercer Island, Washington?

The typical household in Mercer Island, Washington earns about $219,069 a year. Half of households make more than that, and half make less.

Is Mercer Island, Washington expensive?

In Mercer Island, Washington, the median home is worth about $2,000,001, and the typical rent is about $2,502 a month.

How educated are people in Mercer Island, Washington?

About 81.4% of adults age 25 and over in Mercer Island, Washington hold a bachelor's degree or higher.

What is the poverty rate in Mercer Island, Washington?

About 3.8% of people in Mercer Island, Washington live below the federal poverty line.

Has Mercer Island, Washington grown since 1990?

Yes, Mercer Island, Washington has grown since 1990. The population has added about 4,491 residents, a change of about 22 percent over that period.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

How we source and harmonize this data →