Census 2010: Washington › Snohomish County

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

Snohomish County

Square miles: 2,196.3 Population per sq. mile: 341.8

  • 2010 population: 713,335
  • 2000 population: 606,024
  • Total change: 107,311 (17.7%)

See all Washington counties

2010 population by race/ethnicity

Diversity Index: 43.7%
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

Snohomish County population

Race/ethnicity2010 population2010 percentage2000 population2000 percentage2000-2010 change
American Indian/Alaska Native9,7931.4%8,2501.4%18.7%
Native Hawaiian/Pacific Islander3,1350.4%1,7050.3%83.9%
Other race27,1213.8%11,6291.9%133.2%
Two or more races32,7224.6%20,3493.4%60.8%
*Hispanic origin64,2499.0%28,5904.7%124.7%

*Residents of Hispanic origin can be of any race.

Ages 0-17

Population: 174,000 (24.4%)

Diversity Index: 60.9%

Ages 18+

Population: 539,168 (75.6%)

Diversity Index: 42.8%

Race/ethnicityAges 0-17% of 0-17 totalAges 18+% of 18+ total
American Indian/Alaska Native2,8901.7%6,9041.3%
Native Hawaiian/Pacific Islander9290.5%2,2060.4%
Other race9,7405.6%17,3813.2%
Two or more races16,9009.7%15,8102.9%
*Hispanic origin25,30014.5%38,9747.2%

*Residents of Hispanic origin can be of any race.

Population356,958 (50.0%)
Median age36.1
Population356,377 (50.0%)
Median age38.1
Age breakdown by gender
AgePopulation% of totalMale% of male totalFemale% of female total
Under 1094,50013.2%48,20013.5%46,10012.9%
10 to 19 years98,30013.8%50,60014.2%47,70013.4%
20 to 29 years94,20013.2%48,80013.7%45,50012.8%
30 to 39 years100,00014.0%50,90014.3%49,00013.7%
40 to 49 years112,00015.7%56,70015.9%55,30015.5%
50 to 59 years104,00014.6%51,80014.5%51,90014.6%
60 to 69 years61,4008.6%29,6008.3%31,8008.9%
70 to 79 years29,3004.1%13,1003.7%16,2004.5%
80 and older19,8002.8%7,1802.0%12,6003.5%

*Residents of Hispanic origin can be of any race.

Household types
Families 2010
Avg. size 3.1
Households 182,282 (67.9%)
Non-families 2010
Avg. size 2.6
Households 86,043 (32.1%)
Family composition
Households ‡ 2010 % of households % of families
Husband-wife family, without children 77,210 28.8% ...
Husband-wife family, with children under 18 years 63,290 23.6% ...
Single male, no children (with other family) 6,517 2.4% ...
Single male, with children under 18 years 7,339 2.7% ...
Single female, no children (with other family) 11,799 4.4% ...
Single female, with children under 18 years 16,127 6.0% ...
Single male living alone 30,707 11.4% n/a
Single female living alone 34,612 12.9% n/a
Other non-family households (ex.: roommates) 20,724 7.7% n/a
Total 268,325 100% n/a
Family households 182,282 67.9% 100%
Families with children under 18 years 86,756 32.3% ...
Non-family households 86,043 32.1% n/a
All households with individuals 65 years and over 53,584 20.0% 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 size2.4
Vacancy Rate2010
Owner-occupied properties2.4%
Renter-occupied properties6%
Overall vacancy rate6.4%
Housing Units2010% of total
Vacant18,334 6.4%
For rent5,6722.0%
Rented, but unoccupied4070.1%
For sale4,4231.5%
Sold, but unoccupied6950.2%
Seasonal use only3,4831.2%
Other vacant units3,6541.3%

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