Census 2010: Washington › Mercer Island

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Mercer Island

Square miles: 13.1 Population per sq. mile: 3,591.2

  • 2010 population: 22,699
  • 2000 population: 22,036
  • Total change: 663 (3.0%)

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2010 population by race/ethnicity

Diversity Index: 39.4%
The USA TODAY Diversity Index represents the probability that two people from this area will have different ethnic backgrounds. A higher number reflects a more ethnically diverse population.

Age breakdown Median: 46 years old

Mercer Island population

Race/ethnicity2010 population2010 percentage2000 population2000 percentage2000-2010 change
American Indian/Alaska Native510.2%350.2%45.7%
Native Hawaiian/Pacific Islander260.1%160.1%62.5%
Other race1580.7%1140.5%38.6%
Two or more races8863.9%4752.2%86.5%
*Hispanic origin6342.8%4101.9%54.6%

*Residents of Hispanic origin can be of any race.

Ages 0-17

Population: 5,573 (24.6%)

Diversity Index: 49.5%

Ages 18+

Population: 17,126 (75.4%)

Diversity Index: 37.0%

Race/ethnicityAges 0-17% of 0-17 totalAges 18+% of 18+ total
American Indian/Alaska Native230.4%280.2%
Native Hawaiian/Pacific Islander50.1%210.1%
Other race510.9%1070.6%
Two or more races5489.8%3382.0%
*Hispanic origin2163.9%4182.4%

*Residents of Hispanic origin can be of any race.

Population11,046 (48.7%)
Median age45
Population11,653 (51.3%)
Median age46.8
Age breakdown by gender
AgePopulation% of totalMale% of male totalFemale% of female total
Under 102,57411.3%1,36912.4%1,20510.3%
10 to 19 years3,43315.1%1,80916.4%1,62413.9%
20 to 29 years1,4966.6%7466.8%7506.4%
30 to 39 years1,9548.6%9048.2%1,0509.0%
40 to 49 years3,45215.2%1,62014.7%1,83215.7%
50 to 59 years3,88617.1%1,86316.9%2,02317.4%
60 to 69 years2,57611.3%1,28011.6%1,29611.1%
70 to 79 years1,7257.6%7807.1%9458.1%
80 and older1,6037.1%6756.1%9288.0%

*Residents of Hispanic origin can be of any race.

Household types
Families 2010
Avg. size 3.0
Households 6,532 (71.7%)
Non-families 2010
Avg. size 2.5
Households 2,577 (28.3%)
Family composition
Households ‡ 2010 % of households % of families
Husband-wife family, without children 3,196 35.1% ...
Husband-wife family, with children under 18 years 2,475 27.2% ...
Single male, no children (with other family) 111 1.2% ...
Single male, with children under 18 years 154 1.7% ...
Single female, no children (with other family) 246 2.7% ...
Single female, with children under 18 years 350 3.8% ...
Single male living alone 799 8.8% n/a
Single female living alone 1,399 15.4% n/a
Other non-family households (ex.: roommates) 379 4.2% n/a
Total 9,109 100% n/a
Family households 6,532 71.7% 100%
Families with children under 18 years 2,979 32.7% ...
Non-family households 2,577 28.3% n/a
All households with individuals 65 years and over 3,036 33.3% n/a

‡ United States Census Bureau definitions:

Household — A household includes all of the people who occupy a housing unit. People not living in households are classified as living in group quarters. (Ex: college residence halls, skilled-nursing facilities, military barracks, …)
Family — A family includes a householder and one or more people living in the same household who are related to the householder by birth, marriage, or adoption.
Non-family Household — A householder living alone or with nonrelatives only.

Note: Family households and husband-wife-couple families do not include same-sex married couples even if the marriage was performed in a state issuing marriage certificates for same-sex couples. Same-sex-couple households are included in the family households category if there is at least one additional person related to the householder by birth or adoption. Same-sex-couple households with no relatives of the householder present are tabulated in nonfamily households.

Housing Units
Avg. household size2.7
Avg. household size2.0
Vacancy Rate2010
Owner-occupied properties2.2%
Renter-occupied properties10%
Overall vacancy rate8.3%
Housing Units2010% of total
Vacant821 8.3%
For rent2852.9%
Rented, but unoccupied370.4%
For sale1461.5%
Sold, but unoccupied270.3%
Seasonal use only1571.6%
Other vacant units1691.7%

Credits: Ryan Pitts, Mike Tigas Special thanks: USA Today Census team