Mercer Island, Washington Population 2021

25,918
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Mercer Island is a city located in King County Washington. With a 2020 population of 25,918, it is the 43rd largest city in Washington and the 1490th largest city in the United States . Mercer Island is currently growing at a rate of 0.05% annually and its population has increased by 14.18% since the most recent census, which recorded a population of 22,699 in 2010. Mercer Island reached it's highest population of 25,918 in 2021. Spanning over 13 miles, Mercer Island has a population density of 4,061 people per square mile.

The average household income in Mercer Island is $224,619 with a poverty rate of 5.59%. The median rental costs in recent years comes to $2,162 per month, and the median house value is $1.22 Mn. The median age in Mercer Island is 46 years, 45.2 years for males, and 46.4 years for females.

Mercer Island Demographics

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

  • White: 74.22%
  • Asian: 19.39%
  • Two or more races: 3.85%
  • Other race: 1.23%
  • Black or African American: 1.15%
  • Native American: 0.09%
  • Native Hawaiian or Pacific Islander: 0.08%
The current population of Mercer Island, Washington is 25,918 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 25,882.The last official US Census in 2010 recorded the population at 22,699.

Mercer Island, Washington Population 2021

Population by Race

Race Population Percentage
White19,05574.22%
Asian4,97919.39%
Two or More Races9883.85%
Some Other Race3151.23%
Black or African American2951.15%
American Indian and Alaska Native220.09%
Native Hawaiian and Other Pacific Islander210.08%
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Mercer Island Population by Race

Mercer Island Population Pyramid $2021

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Mercer Island Median Age

46


Total

45.2


Male

46.4


Female

Mercer Island Adults

There are 19,720 adults, (5,229 of whom are seniors) in Mercer Island.

Mercer Island Age Dependency

77.2

Age Dependency Ratio

36.1

Old Age Dependency Ratio

41.1

Child Dependency Ratio

Mercer Island Sex Ratio

Female

13,236

51.55%

Male

12,439

48.45%

Mercer Island Population by Age

Mercer Island Renter vs Owner Occupied by Household Type

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Mercer Island Household Types

Type Owner Renter
Married83.7%16.3%
All68.7%31.3%
Female55.4%44.6%
Male47.1%52.9%
Non Family43.1%56.9%

68.7%

Rate of Home Ownership

Mercer Island Households and Families

Type Count Average Size Owned
All10,1992.568.7
Married6,1913.0783.7
Non Family3,0151.2543.1
Female6792.8355.4
Male3142.6147.1

2.99

Average Family Size

2.5

Average Household Size

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Mercer Island Households by Type

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Education Attained Count Percentage
Less Than 9th Grade1750.95%
9th to 12th Grade2151.16%
High School Graduate1,0705.79%
Some College1,8039.76%
Associates Degree7614.12%
Bachelors Degree7,36339.84%
Graduate Degree7,09338.38%
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Mercer Island Educational Attainment by Sex (over 25)

Mercer Island Educational Attainment by Race

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Race Total High School Bachelors
White13,59413,41710,863
Asian3,7983,6322,955
Hispanic534516260
2+ Races389385273
Other Race16715490
Black926733
Native American222221

The highest rate of high school graduation is among native american people with a rate of 100.00%.

The highest rate of bachelors degrees is among native american people with a rate of 95.45%.

Mercer Island Educational Attainment by Race

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Name Average Male Female
Overall$91,189$119,554$63,486
Less Than 9th Grade$$$9,000
High School Graduate$37,244$49,792$26,297
Some College$37,962$63,162$26,714
Bachelors Degree$76,541$102,908$62,389
Graduate Degree$127,595$175,446$95,375

$91,189

Average Earnings

$119,554

Average Male

$63,486

Average Female

Mercer Island Earnings by Educational Attainment

Mercer Island Language by Age

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Mercer Island Language

79.19% of Mercer Island residents speak only English, while 20.81% speak other languages. The non-English language spoken by the largest group is Asian and Pacific Island languages, which is spoken by 11.74% of the population.

Mercer Island Language

Mercer Island Poverty by Race

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Name Total In Poverty Poverty Rate
White18,2567163.92%
Asian4,9603046.13%
Hispanic84218021.38%
Black29514248.14%
Other3159128.89%
Multiple979616.23%
Islander2121100.00%

5.59%

Overall Poverty Rate

4.17%

Male Poverty Rate

6.93%

Female Poverty Rate

Poverty in Mercer Island

The race most likely to be in poverty in Mercer Island is Islander, with 100.00% below the poverty level.

The race least likely to be in poverty in Mercer Island is White, with 3.92% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.48%. Among those working part-time, it was 8.03%, and for those that did not work, the poverty rate was 8.53%.

Mercer Island Poverty

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Name Poverty
Less Than 9th Grade28.23%
Some College10.30%
High School6.69%
Bachelors or Greater3.00%

Mercer Island Poverty Rate by Education

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Rate Poverty
Female Unemployed53.02%
Male Unemployed13.76%
Female Employed3.79%
Male Employed2.07%

Mercer Island Poverty Rate by Employment Status and Sex

Mercer Island Income by Household Type

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Name Median Mean
Households$147,566$224,619
Families$205,056$276,502
Married Families$220,236-
Non Families$63,116$95,709
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Income by Household Type

Mercer Island Marital Status

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Marriage Rates

63.6%

Overall Marriage Rate

66.9%

Male Marriage Rate

60.7%

Female Marriage Rate

Mercer Island Married by Age and Sex

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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

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Mercer Island Marital Status

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1,255

Number of Veterans

1,179

Male Veterans

76

Female Veterans

War Veterans
Vietnam497
World War II192
Korea176
First Gulf War153
Second Gulf War48

Mercer Island Veterans by War

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Age Group Veterans
75+586
65 to 74355
35 to 54170
55 to 64144
18 to 34

Mercer Island Veterans by Age

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Name Veterans % of Total
White1,1237.53%
Asian942.36%
Hispanic193.45%
Other Race1910.80%
Black149.27%
2+ Races51.10%

Mercer Island Veterans by Race

Mercer Island Veterans by Education

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3.52%

Veteran Poverty Rate

39.23%

Veteran Disability Rate

Mercer Island Veterans by Education

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63%

Labor Force Participation

60.5%

Employment Rate

4%

Unemployment Rate

Mercer Island Employment by Age

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Mercer Island Employment by Race

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Mercer Island Employment by Education

Origin of Non-Citizens

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

Origin of Naturalized Citizens

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33.43%

Born in Mercer Island

78.96%

Native Born

21.04%

Foreign Born

7.75%

Non Citizen

13.29%

Naturalized

Place of Birth

78.96% of Mercer Island residents were born in the United States, with 33.43% having been born in Washington. 7.75% 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

Year Population Growth Annual Growth Rate
202125,918120.05%
202025,906120.05%
201925,894120.05%
201825,8821620.63%
201725,7201360.53%
201625,5842340.92%
201525,3506242.52%
201424,7263081.26%
201324,4183821.59%
201224,0365082.16%
201123,5287593.33%
201022,7697330.33%
200022,0361,2200.57%
199020,816-706-0.33%
198021,5222,4751.23%
197019,0477,0474.73%
196012,0000.00%

Mercer Island Population by Year