Population 844,430 · Census ACS 2020–24
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Population and households in Snohomish County
Household size in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.65 | 2.52 | 2.56 | 2.68 |
| 2010–14 | 2.72 | 2.59 | 2.62 | 2.73 |
| 2015–19 | 2.72 | 2.62 | 2.62 | 2.71 |
| 2020–24 | 2.71 | 2.60 | 2.61 | 2.65 |
| Change | +0.06 | +0.09 | +0.05 | −0.03 |
Households in Snohomish County average 2.71 people, about the same as the country as a whole (2.65). The typical household here is bigger than in the Seattle area as a whole, where it has 2.60 people. Household size has crept up from 2.65 in 2006–10, even as the national average fell.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 37.3 | 37.5 | 38.0 | 37.7 |
| 2010–14 | 38.5 | 38.1 | 38.7 | 38.6 |
| 2015–19 | 39.3 | 38.5 | 39.3 | 39.6 |
| 2020–24 | 39.7 | 38.8 | 39.6 | 40.1 |
| Change | +2.4 | +1.3 | +1.6 | +2.3 |
At 39.7, the median age in Snohomish County is close to the national median of 40.1, so its age mix looks much like the country's. The median age has climbed from 37.3 in 2006–10, in line with the national trend.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 10.7% | 10.3% | 10.9% | 12.3% |
| 2010–14 | 10.4% | 10.0% | 10.6% | 12.3% |
| 2015–19 | 9.9% | 9.2% | 10.1% | 11.6% |
| 2020–24 | 9.1% | 9.1% | 10.1% | 11.6% |
| Change | −1.6 pts | −1.2 pts | −0.8 pts | −0.6 pts |
Single-parent households are less common in Snohomish County than nationally: 9.1%, against 11.6%. The picture is much the same across the Seattle area. The single-parent share has fallen 1.6 points since 2006–10, as it has nationally.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Snohomish County
Renters in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 31.9% | 37.7% | 35.2% | 33.3% |
| 2010–14 | 33.5% | 40.0% | 37.3% | 35.6% |
| 2015–19 | 32.9% | 39.9% | 37.0% | 36.0% |
| 2020–24 | 31.8% | 40.0% | 36.2% | 34.8% |
| Change | −0.1 pts | +2.3 pts | +1.0 pts | +1.5 pts |
Nearly a third of households in Snohomish County rent their homes (31.8%), close to the national share of 34.8%. Renters make up a smaller share here than in the Seattle area as a whole (40.0%). Among homeowners, 28.7% have no mortgage at all, well below the national share of 39.8%. Renting is most common in the west and least common in the southeast.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 7.3% | 7.9% | 9.2% | 11.4% |
| 2010–14 | 7.7% | 7.8% | 9.2% | 11.4% |
| 2015–19 | 6.2% | 6.8% | 8.2% | 11.1% |
| 2020–24 | 5.8% | 6.6% | 7.6% | 9.6% |
| Change | −1.4 pts | −1.3 pts | −1.6 pts | −1.8 pts |
Vacancy is on the low side in Snohomish County: 5.8% of homes sit empty, against 9.6% nationally, which points to steady demand for housing. Vacancy is down 1.4 points from 2006–10, mirroring the country. Of Washington's 39 counties, only two have a lower vacancy rate.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 1984 | 1977 | 1977 | 1974 |
| 2010–14 | 1985 | 1978 | 1979 | 1975 |
| 2015–19 | 1987 | 1980 | 1980 | 1977 |
| 2020–24 | 1989 | 1983 | 1984 | 1980 |
| Change | +5 | +7 | +6 | +6 |
Snohomish County has newer housing than the country as a whole: the median home was built in 1989, versus 1980 nationally. The median year built has moved up from 1984 in 2006–10, a sign of steady new building. Newer construction is concentrated in the south, while the center has the oldest housing.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,181 | $1,162 | $1,018 | $965 |
| 2010–14 | $1,300 | $1,284 | $1,127 | $1,040 |
| 2015–19 | $1,623 | $1,644 | $1,390 | $1,213 |
| 2020–24 | $2,169 | $2,193 | $1,875 | $1,571 |
| Change | +$988 | +$1,031 | +$858 | +$606 |
A typical rental in Snohomish County costs $2,169 a month with utilities, well above the national median of $1,571. Rent has climbed $988 a month since 2006–10, up 84%, faster than rents rose nationally. Rent takes 32.2% of the typical renter's income, just over the 30% mark often used to define affordable rent. Only one other Washington county has higher rents.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Snohomish County
Bachelor's degrees in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 28.4% | 36.7% | 31.0% | 28.4% |
| 2010–14 | 29.4% | 38.0% | 32.1% | 29.6% |
| 2015–19 | 32.9% | 42.3% | 35.5% | 32.1% |
| 2020–24 | 38.5% | 46.3% | 38.8% | 35.6% |
| Change | +10.1 pts | +9.6 pts | +7.8 pts | +7.2 pts |
Nearly four in ten adults 25 and older in Snohomish County (38.5%) hold at least a bachelor's degree, close to the national share of 35.6%. The share is lower than in the Seattle area as a whole (46.3%). The share with a degree is up 10.1 points from 2006–10, mirroring the country.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 90.8% | 91.3% | 89.5% | 84.9% |
| 2010–14 | 91.4% | 91.6% | 90.0% | 86.1% |
| 2015–19 | 92.4% | 92.5% | 91.0% | 87.7% |
| 2020–24 | 93.1% | 93.1% | 91.9% | 89.3% |
| Change | +2.3 pts | +1.8 pts | +2.4 pts | +4.3 pts |
High school completion in Snohomish County is above the national rate: 93.1% of adults have a diploma or equivalent, against 89.3%. The picture is much the same across the Seattle area. Since 2006–10, the share with a diploma has risen 2.3 points, mirroring the country.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Snohomish County
| Period | Snohomish County | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 7.1% | 6.9% | 7.6% | 8.1% |
| 2010–14 | 8.7% | 8.3% | 8.9% | 9.4% |
| 2015–19 | 4.1% | 4.5% | 5.1% | 5.6% |
| 2020–24 | 4.5% | 5.0% | 5.1% | 5.4% |
| Change | −2.6 pts | −2.0 pts | −2.5 pts | −2.7 pts |
Unemployment in Snohomish County runs below the national rate: 4.5% of the labor force was out of work and looking, against 5.4% nationally. Unemployment has fallen 2.6 points since 2006–10, in line with the national trend. Each figure pools five years of surveys (2020–24), so it describes that whole stretch rather than today's job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Snohomish County compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Snohomish County | 2.71 | 39.7 | 9.1% | 31.8% | 5.8% | 1989 | $2,169 | 38.5% | 93.1% | 4.5% |
| King County | 2.53 | 38.6 | 7.8% | 44.6% | 7.0% | 1981 | $2,293 | 55.7% | 93.4% | 5.0% |
| Island County | 2.42 | 47.2 | 7.4% | 25.3% | 15.1% | 1988 | $1,714 | 35.5% | 95.7% | 4.2% |
| Jefferson County | 2.05 | 58.4 | 6.3% | 21.0% | 14.5% | 1986 | $1,536 | 43.9% | 95.4% | 6.9% |
| Kitsap County | 2.56 | 41.6 | 10.0% | 29.9% | 8.4% | 1984 | $1,936 | 37.2% | 95.4% | 4.6% |
| Skagit County | 2.52 | 43.2 | 11.0% | 29.9% | 8.2% | 1984 | $1,625 | 29.2% | 91.2% | 4.9% |
| Clallam County | 2.22 | 51.7 | 8.8% | 26.3% | 9.8% | 1982 | $1,296 | 30.8% | 93.8% | 5.2% |
| Chelan County | 2.61 | 41.4 | 9.6% | 35.4% | 14.2% | 1981 | $1,300 | 30.8% | 86.3% | 3.9% |
| Douglas County | 2.76 | 39.5 | 14.3% | 30.7% | 10.6% | 1986 | $1,489 | 21.7% | 82.4% | 3.7% |
| Okanogan County | 2.37 | 43.9 | 13.5% | 27.6% | 18.6% | 1982 | $944 | 24.6% | 85.0% | 4.8% |
| Lincoln County | 2.41 | 45.9 | 8.6% | 19.6% | 15.7% | 1966 | $889 | 24.0% | 92.2% | 7.5% |
All figures 2020–24.
Counties with similar populations: Ventura County, CA · Travis County, TX · Westchester County, NY · St. Louis County, MO · Prince George's County, MD · Shelby County, TN · Fort Bend County, TX · Fairfield County, CT · Middlesex County, MA · Fairfax County, VA
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Snohomish County. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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