Where does this demographic data come from?

All demographic data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates, which samples about 3.5 million households annually. The 5-year estimates provide the most reliable data for small geographies like municipalities.

What is the difference between Census data and ACS data?

The decennial Census (conducted every 10 years) is a full population count focusing on basic demographics. The ACS is an ongoing survey that collects detailed data on income, education, housing, commute patterns, and more. ACS data is updated annually but represents averages over a 5-year period.

How accurate is this data for small towns?

For smaller municipalities, ACS estimates have wider margins of error because fewer residents are sampled. The 5-year estimates reduce this uncertainty by averaging over a longer period. For towns under 5,000 people, treat specific numbers as approximations rather than precise counts.

Mercer Island, WA Population, Income & Demographics 2026

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Demographics — 2024 ACS 5-Year Estimatesi

Census

Populationi

25,307

Median Agei

46.4

Race & Ethnicityi

White

63.3%16,021

Asian

24.4%6,175

Two or More

8.4%2,118

Hispanic/Latino

2.4%615

Black

0.9%216

Other

0.6%162

Educational Attainment (Age 25+)i

GED/Alternative

0.1%25

High School Diploma

4.9%895

Some College (<1 yr)

0.8%148

Some College (1+ yr)

6.5%1,189

Associate's Degree

4.6%834

Bachelor's Degree

36.8%6,704

Master's Degree

23.9%4,362

Professional Degree

11.7%2,126

Doctorate

9.1%1,656

HS or Higher

98.4%

BA or Higher

81.4%

Graduate+

44.7%

Housingi

Median Home Valuei

$2,000,001

Median Renti

$2,502

Tenure

Owner-Occupied

67%6,746

Renter-Occupied

33%3,322

Total Units

10,609

Homeownership

67%

Vacancy Rate

5.1%

Home Values

Under $50K

1.5%102

$100K–$150K

0.9%59

$150K–$200K

0.2%13

$200K–$300K

0.5%37

$300K–$500K

2.9%197

$500K–$1M

4.5%304

$1M+

89.4%6,034

Rent Distribution

Under $500

$750–$1,000

$1,000–$1,250

$1,250–$1,500

127

$1,500–$2,000

488

$2,000+

2,482

Year Built

2020 or later

1.6%165

2010–2019

8.7%926

2000–2009

12.7%1,350

1990–1999

6.2%655

1980–1989

9.6%1,014

1970–1979

15.9%1,687

1960–1969

23.6%2,506

1950–1959

11.5%1,215

1940–1949

6.9%737

1939 or earlier

3.3%354

Heating Fuel

Utility Gas

58.2%5,860

Electricity

37.9%3,815

Fuel Oil

1.2%124

Bottled/LP Gas

1%99

No Fuel

0.7%69

Other

0.7%66

Solar

0.3%35

Economyi

Median Household Incomei

$219,069

Mean Household Incomei

$318,528

Per Capita Incomei

$128,615

Poverty Ratei

3.8%

Unemploymenti

Labor Forcei

12,606

Household Income Distribution

Under $10K

3.1%315

$10K–$15K

0.6%60

$15K–$20K

1.7%171

$20K–$25K

1.3%126

$25K–$30K

0.8%76

$30K–$35K

2.6%257

$35K–$40K

2.6%257

$40K–$45K

1.5%149

$45K–$50K

0.8%83

$50K–$60K

2.8%282

$60K–$75K

4.3%428

$75K–$100K

6.1%617

$100K–$125K

4.6%465

$125K–$150K

4.1%413

$150K–$200K

9.7%974

$200K+

53.6%5,395

Ancestry & Heritage

Self-reported ancestry groups. Residents may report multiple ancestries, so totals may exceed 100%.

Foreign-Born Populationi

Foreign-Borni

6,69126.4%

By Region

Top Countries

China

1,673

India

680

Korea

498

Canada

329

United Kingdom

307

Germany

185

Philippines

114

Mexico

Commute & Transportationi

Workersi

12,029

Avg. Commutei

23.6 min

How People Get to Work

Travel Time to Work

Workforce

Total Employed

12,219

Occupations

Industries

Social Characteristicsi

Marital Status (15+)i

Veteransi

915(4.6% of civilian adults)

Health Insurancei

98.8%Insured

1.2%Uninsured