Mercer Island, Washington Population 2020

26,246
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Mercer Island is a city located in Washington. With a 2020 population of 26,246, it is the 42nd largest city in Washington and the 1460th largest city in the United States. Mercer Island is currently growing at a rate of 0.52% annually and its population has increased by 15.63% since the most recent census, which recorded a population of 22,699 in 2010. Spanning over 13 miles, Mercer Island has a population density of 4,112 people per square mile.

The average household income in Mercer Island is $219,325 with a poverty rate of 4.70%. The median rental costs in recent years comes to $1,977 per month, and the median house value is $1.14 Mn. The median age in Mercer Island is 46 years, 45.3 years for males, and 46.3 years for females. For every 100 females there are 94.3 males.

Mercer Island Demographics

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

  • White: 74.00%
  • Asian: 19.94%
  • Two or more races: 3.75%
  • Black or African American: 1.17%
  • Other race: 1.04%
  • Native Hawaiian or Pacific Islander: 0.07%
  • Native American: 0.04%
The current population of Mercer Island, Washington is 26,246, based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 25,976.The last official US Census in 2010 recorded the population at 22,699.

Mercer Island, Washington Population 2020

Population by Race

Race Population Percentage
White18,86474.00%
Asian5,08219.94%
Two or More Races9573.75%
Black or African American2971.17%
Some Other Race2641.04%
Native Hawaiian and Other Pacific Islander190.07%
American Indian and Alaska Native90.04%
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Mercer Island Population Pyramid 2020

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Mercer Island Median Age

46


Total

45.3


Male

46.3


Female

Mercer Island Adults

There are 19,446 adults, (5,207 of whom are seniors) in Mercer Island.

Mercer Island Age Dependency

79

Age Dependency Ratio

36.6

Old Age Dependency Ratio

42.5

Child Dependency Ratio

Mercer Island Sex Ratio

Female

13,117

51.46%

Male

12,375

48.54%

Mercer Island Households and Families

Mercer Island Renter vs Owner Occupied by Household Type

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Mercer Island Household Types

Type Owner Renter
Married85.8%14.2%
All70.5%29.5%
Female61.5%38.5%
Non Family42.8%57.2%
Male38.7%61.3%

70.5%

Rate of Home Ownership

Type Count Average Size Owned
All10,1232.5170.5
Married6,3293.0785.8
Non Family2,9421.2242.8
Female5192.8261.5
Male3332.5838.7

3

Average Family Size

2.51

Average Household Size

3.6%

Unmarried (Opposite Sex)

0.9%

Unmarried (Same Sex)

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Mercer Island Education

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Education Attained Count Percentage
Less Than 9th Grade1400.77%
9th to 12th Grade2131.18%
High School Graduate1,0035.55%
Some College1,7719.79%
Associates Degree6643.67%
Bachelors Degree7,13139.43%
Graduate Degree7,16539.61%
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Mercer Island Educational Attainment by Race

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Name Total High School Bachelors
White13,16213,01010,669
Asian3,7743,6022,952
Hispanic533510257
Multiple Races403398269
Black176175111
Other Race14512775
Native American998

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 88.89%.

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Name Average Male Female
Overall$94,894$125,969$63,456
Less Than High School$11,196$$9,646
High School Grad$42,569$53,313$26,705
Some College$43,466$62,935$25,887
Bachelors Degree$88,042$110,774$64,132
Graduate Degree$123,625$160,299$92,500

$94,894

Average Earnings

$125,969

Average Male

$63,456

Average Female

Mercer Island Language

Mercer Island Language by Age

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Mercer Island Language

79.47% of Mercer Island residents speak only English, while 20.53% speak other languages. The non-English language spoken by the largest group is Asian and Pacific Island languages, which is spoken by 11.26% of the population.

Mercer Island Poverty

Mercer Island Poverty by Race

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Name Total In Poverty Poverty Rate
White18,0907073.91%
Asian5,0652565.05%
Hispanic82714817.90%
Other2568232.03%
Black2973913.13%
Multiple949212.21%
Islander1919100.00%

4.70%

Overall Poverty Rate

3.37%

Male Poverty Rate

5.96%

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 Multiple, with 2.21% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 0.89%. Among those working part-time, it was 6.72%, and for those that did not work, the poverty rate was 8.65%.

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Name Poverty
Less Than High School26.83%
High School11.55%
Some College8.35%
Bachelors or Greater2.78%
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Name Poverty
Female Unemployed53.85%
Male Unemployed12.61%
Female Employed2.77%
Male Employed1.44%

Mercer Island Income

Mercer Island Income by Household Type

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Name Median Mean
Households$142,413$219,325
Families$201,495$264,112
Married Families$211,372-
Non Families$65,417$107,089
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Mercer Island Marital Status

Mercer Island Marital Status

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Marriage Rates

64.1%

Overall Marriage Rate

68.0%

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 45-54.

Mercer Island Marital Status by Race

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Mercer Island Veterans

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1,450

Number of Veterans

1,363

Male Veterans

87

Female Veterans

War Veterans
Vietnam527
World War II213
Korea186
First Gulf War148
Second Gulf War42
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Age Group Veterans
75+672
65 to 74410
35 to 54211
55 to 64157
18 to 34
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Name Veterans % of Total
White1,2428.53%
Asian1263.16%
Black6327.27%
Hispanic142.48%
Other149.21%
2 or More51.03%

Mercer Island Veterans by Education

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2.87%

Veteran Poverty Rate

34.66%

Veteran Disability Rate

Mercer Island Employment Status

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61.9%

Labor Force Participation

59.7%

Employment Rate

3.6%

Unemployment Rate

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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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34.94%

Born in Washington

79.04%

Native Born

20.96%

Foreign Born

7.14%

Non Citizen

13.83%

Naturalized

Place of Birth

79.04% of Mercer Island residents were born in the United States, with 34.94% having been born in Washington. 7.14% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Year Population Growth Annual Growth Rate
202026,2461350.52%
201926,1111350.52%
201825,9762230.87%
201725,7531350.53%
201625,6182370.93%
201525,3816212.51%
201424,7603171.30%
201324,4433851.60%
201224,0585162.19%
201123,5427733.39%
201022,7697330.33%
200022,0361,2200.57%
199020,816-706-0.33%
198021,5222,4751.23%
197019,0477,0474.73%
196012,0000.00%