Mercer Island, Washington Population 2024

24,600

Mercer Island is a city located in King County Washington. Mercer Island has a 2024 population of 24,600. Mercer Island is currently declining at a rate of -1.15% annually and its population has decreased by -4.44% since the most recent census, which recorded a population of 25,744 in 2020.

The average household income in Mercer Island is $290,655 with a poverty rate of 5.26%. The median rental costs in recent years comes to - per month, and the median house value is -. The median age in Mercer Island is 45.3 years, 44.8 years for males, and 45.7 years for females.

Mercer Island Demographics

According to the most recent ACS, the racial composition of Mercer Island was:

  • White: 66.3%
  • Asian: 22.22%
  • Two or more races: 8.89%
  • Black or African American: 1.34%
  • Other race: 1.16%
  • Native American: 0.09%
  • Native Hawaiian or Pacific Islander: 0%
Land Area (mi²)
6.4 sq mi
Density (mi²)
3,854.20/sq mi
Growth Since 2020
-4.44% (-1,144)
The current population of Mercer Island, Washington is 24,600 based on our projections of the latest US Census estimates.The last official US Census in 2020 recorded the population at 25,744.

Mercer Island, Washington Population 2024

Population by Race

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Race
Population
Percentage (of total)
White16,88266.3%
Asian5,65822.22%
Two or more races2,2648.89%
Black or African American3401.34%
Other race2961.16%
Native American240.09%
Native Hawaiian or Pacific Islander00%

White

Asian

Two or more races

Black or African American

Other race

Native American

Native Hawaiian or Pacific Islander

Mercer Island Population by Race

Mercer Island Population Pyramid 2024

Mercer Island Median Age

45.3

Total

44.8

Male

45.7

Female

Mercer Island Adults

There are 19,582 adults, (5,205 of whom are seniors) in Mercer Island.

Mercer Island Age Dependency

77.1

Age Dependency Ratio

36.2

Old Age Dependency Ratio

40.9

Child Dependency Ratio

Mercer Island Sex Ratio

Female13,45652.84%
Male12,00847.16%

Mercer Island Population by Age

Mercer Island Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All9,7822.596832
Married6,2983.1782.117.9
Non Family2,8131.2139.760.3
Female4842.8546.753.3
Male1872.8171.728.3

3.1

Average Family Size

2.59

Average Household Size

68.0%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Mercer Island Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

Mercer Island Educational Attainment by Sex (over 25)

Mercer Island Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among native american people with a rate of 100%.

The highest rate of bachelors degrees is among asian people with a rate of 80.96%.

Mercer Island Educational Attainment by Race

All

Male

Female

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$115,150

Average Earnings

$160,000

Average Male

$79,929

Average Female

Mercer Island Earnings by Educational Attainment

Mercer Island Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Mercer Island Language

76.03% of Mercer Island residents speak only English, while 23.97% speak other languages. The non-English language spoken by the largest group is Asian and Pacific Island languages, which is spoken by 13.87% of the population.

Mercer Island Language

Mercer Island Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
White16,5175033.05%
Asian5,6293886.89%
Multiple2,2641868.22%
Hispanic82618522.4%
Black33812436.69%
Other2965618.92%

5.26%

Overall Poverty Rate

3.88%

Male Poverty Rate

6.49%

Female Poverty Rate

Poverty in Mercer Island

The race most likely to be in poverty in Mercer Island is Black, with 36.69% below the poverty level.

The race least likely to be in poverty in Mercer Island is White, with 3.05% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.43%. Among those working part-time, it was 5.51%, and for those that did not work, the poverty rate was 8.8%.

Mercer Island Poverty

rate

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Rate
Poverty
Less Than 9th Grade25.25%
Some College10.09%
High School10.09%
Bachelors or Greater3.33%

Mercer Island Poverty Rate by Education

rate

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Rate
Poverty
Female Unemployed27.78%
Male Unemployed8.82%
Female Employed2.74%
Male Employed1.95%

Mercer Island Poverty Rate by Employment Status and Sex

Mercer Island Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

Mercer Island Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

64.4%

Overall Marriage Rate

68.7%

Male Marriage Rate

60.7%

Female Marriage Rate

Mercer Island Married by Age and Sex

male

female

Mercer Island Marriage

The age group where males are most likely to be married is 35-44, while the female age group most likely to be married is 35-44.

Mercer Island Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Mercer Island Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

856

Number of Veterans

815

Male Veterans

41

Female Veterans

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Mercer Island Veterans by War

count

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Mercer Island Veterans by Age

count

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Mercer Island Veterans by Race

Mercer Island Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

2.72%

Veteran Poverty Rate

38.7%

Veteran Disability Rate

Mercer Island Veterans by Education

LaborForceParticipation

59.4%

Labor Force Participation

57.9%

Employment Rate

2.6%

Unemployment Rate

Mercer Island Employment by Age

LaborForceParticipation

Mercer Island Employment by Race

LaborForceParticipation

Mercer Island Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

34.25%

Born in Mercer Island

75.43%

Native Born

24.57%

Foreign Born

10.04%

Non Citizen

14.53%

Naturalized

Place of Birth

75.43% of Mercer Island residents were born in the United States, with 34.25% having been born in Washington. 10.04% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Mercer Island Place of Birth

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
202923,170-286-1.22%
202823,456-286-1.2%
202723,742-286-1.19%
202624,028-286-1.18%
202524,314-286-1.16%
202424,600-286-1.15%
202324,886-286-1.14%
202225,172-320-1.26%
202125,492-252-0.98%
202025,744-133-0.51%
201925,877-29-0.11%
201825,9061500.58%
201725,7561330.52%
201625,6232400.95%
201525,3836272.53%
201424,7563111.27%
201324,4453841.6%
201224,0615162.19%
201123,5457753.4%
201022,77000%
200022,0361,2205.86%
199020,816-706-3.28%
198021,5222,47512.99%
197019,0477,04758.73%
196012,000-11,170-48.21%
showing: 25 rows

Mercer Island Population by Year