Census 2010: Washington › King County

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(Mapping 100 largest census tracts, by 2010 population.)

King County

Square miles: 2,306.9 Population per sq. mile: 912.9

  • 2010 population: 1,931,249
  • 2000 population: 1,737,034
  • Total change: 194,215 (11.2%)

See all Washington counties

2010 population by race/ethnicity

Diversity Index: 54.9%
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: 37.1 years old

King County population

Race/ethnicity2010 population2010 percentage2000 population2000 percentage2000-2010 change
American Indian/Alaska Native16,1470.8%15,9220.9%1.4%
Native Hawaiian/Pacific Islander14,4860.8%9,0130.5%60.7%
Other race76,0963.9%44,4732.6%71.1%
Two or more races96,7995.0%70,4994.1%37.3%
*Hispanic origin172,3788.9%95,2425.5%81.0%

*Residents of Hispanic origin can be of any race.

Ages 0-17

Population: 413,502 (21.4%)

Diversity Index: 71.8%

Ages 18+

Population: 1,517,747 (78.6%)

Diversity Index: 53.8%

Race/ethnicityAges 0-17% of 0-17 totalAges 18+% of 18+ total
American Indian/Alaska Native3,9461.0%12,2010.8%
Native Hawaiian/Pacific Islander4,5811.1%9,9050.7%
Other race25,1726.1%50,9243.4%
Two or more races45,23110.9%51,5683.4%
*Hispanic origin59,29914.3%113,0797.5%

*Residents of Hispanic origin can be of any race.

Population962,090 (49.8%)
Median age36.3
Population969,159 (50.2%)
Median age37.9
Age breakdown by gender
AgePopulation% of totalMale% of male totalFemale% of female total
Under 10233,58912.1%119,51512.4%114,07411.8%
10 to 19 years228,30311.8%116,95012.2%111,35311.5%
20 to 29 years290,47815.0%147,33615.3%143,14214.8%
30 to 39 years301,21915.6%153,51116.0%147,70815.2%
40 to 49 years295,46915.3%150,34615.6%145,12315.0%
50 to 59 years269,56714.0%133,79413.9%135,77314.0%
60 to 69 years169,2628.8%81,6128.5%87,6509.0%
70 to 79 years80,6304.2%36,4153.8%44,2154.6%
80 and older62,7323.2%22,6112.4%40,1214.1%

*Residents of Hispanic origin can be of any race.

Household types
Families 2010
Avg. size 3.1
Households 461,510 (58.5%)
Non-families 2010
Avg. size 2.4
Households 327,722 (41.5%)
Family composition
Households ‡ 2010 % of households % of families
Husband-wife family, without children 198,845 25.2% ...
Husband-wife family, with children under 18 years 158,646 20.1% ...
Single male, no children (with other family) 17,257 2.2% ...
Single male, with children under 18 years 14,798 1.9% ...
Single female, no children (with other family) 31,901 4.0% ...
Single female, with children under 18 years 40,063 5.1% ...
Single male living alone 115,616 14.6% n/a
Single female living alone 129,083 16.4% n/a
Other non-family households (ex.: roommates) 83,023 10.5% n/a
Total 789,232 100% n/a
Family households 461,510 58.5% 100%
Families with children under 18 years 213,507 27.1% ...
Non-family households 327,722 41.5% n/a
All households with individuals 65 years and over 154,215 19.5% 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 size2.6
Avg. household size2.1
Vacancy Rate2010
Owner-occupied properties2.6%
Renter-occupied properties7.4%
Overall vacancy rate7.3%
Housing Units2010% of total
Vacant62,029 7.3%
For rent25,8123.0%
Rented, but unoccupied1,7780.2%
For sale12,7501.5%
Sold, but unoccupied2,3370.3%
Seasonal use only8,1121.0%
Other vacant units11,2401.3%

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