Census tract · Snohomish County
Census Tract 521.21, Snohomish County, Washington
Census Tract 521.21, GEOID 53061052121, in Snohomish County, Washington, entirely within Silver Firs. 3,752 residents in the ACS 2020-2024 5-year estimates (±430); the 2020 Census counted 3,737.
Residents, 2020-2024
3,752
±430 (90% margin)
2020 Census count: 3,737
Median household income
$177,625
±$33,246 (90% margin)
Snohomish County: $111,246
Median home value
$787,200
±$57,934 (90% margin)
Snohomish County: $696,000
Median gross rent
$2,666
±$194 (90% margin)
Snohomish County: $1,949
Where is Census Tract 521.21?
Census Tract 521.21 is one of 175 census tracts in Snohomish County, Washington. It covers 1.02 square miles of land, 3,649 residents per square mile in 2020. Its GEOID, 53061052121, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Silver Firs | 100% |
6 census tracts border Census Tract 521.21: Tract 416.09 ($127,716), Tract 416.10 ($156,089), Tract 521.05 ($128,833), Tract 521.19 ($147,619), Tract 521.20 ($153,350) and Tract 521.22 ($175,450). The figure in brackets is each tract's median household income.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 521.21?
The 2020-2024 American Community Survey puts Census Tract 521.21's population at 3,752 (±430) in 1,231 households; the 2020 Census counted 3,737 residents and 1,246 housing units.
| Measure | Tract 521.21 | Silver Firs |
|---|---|---|
| Total population | 3,752±430 | 22,306 |
| Households | 1,231±130 | 7,655 |
| Average household size | 3.04±0.27 | 2.91 |
| Housing units | 1,241±130 | 7,719 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 521.21?
The median resident of Census Tract 521.21 is 37.7 years old; 22.3% are under 18 and 7.4% are 65 or older. The largest group is non-Hispanic white residents at 67.6%, then non-Hispanic Asian residents at 11.8%. 15.1% of residents were born outside the United States.
| Measure | Tract 521.21 | Silver Firs |
|---|---|---|
| Median age | 37.7±3.7 | 38.5 |
| Under 18 years | 22.3%±3.7 pts | 24.2% |
| 65 years and over | 7.4%±2.3 pts | 9.8% |
| Hispanic or Latino (any race) | 9.7%±5.5 pts | 9.2% |
| White alone, not Hispanic | 67.6%±7.8 pts | 61.3% |
| Black or African American alone, not Hispanic | 0.0%±0.1 pts | 1.2% |
| Asian alone, not Hispanic | 11.8%±4.1 pts | 18.3% |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.4 pts | 0.3% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.1 pts | 0.0% |
| Two or more races, not Hispanic | 9.9%±4.6 pts | 8.9% |
| Some other race alone, not Hispanic | 0.7%±0.8 pts | 0.8% |
| Born outside the United States | 15.1%±5.2 pts | 20.2% |
| Speak a language other than English at home (age 5+) | 17.5%±5.8 pts | 25.2% |
| Civilian veterans (age 18+) | 7.6%±5.6 pts | 4.8% |
| With a disability | 4.3%±2.0 pts | 6.4% |
| No health insurance coverage | 2.6%±1.7 pts | 3.4% |
| High school graduate or higher (age 25+) | 95.5%±3.0 pts | 95.9% |
| Bachelor's degree or higher (age 25+) | 36.6%±7.7 pts | 51.9% |
| Graduate or professional degree (age 25+) | 12.3%±4.1 pts | 18.8% |
| Lived in the same house a year earlier | 97.3%±2.1 pts | 93.1% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Census Tract 521.21 earn?
Half of the 1,231 households in Census Tract 521.21 earn less than $177,625 a year (±$33,246), against $111,246 across Snohomish County: 10th highest of the county's 173 tracts with a reliable estimate.
| Measure | Tract 521.21 | Silver Firs |
|---|---|---|
| Median household income | $177,625±$33,246 | $163,418 |
| Mean household income | $198,125±$24,572 | $194,407 |
| Per capita income | $65,823±$6,388 | $67,790 |
| People below the poverty line | 2.4%±1.7 pts | 5.9% |
| Children under 18 below the poverty line | 1.7%±2.9 pts | 5.5% |
| Households receiving SNAP | 2.4%±2.4 pts | 3.1% |
| Households with a computer | 100.0%±3.2 pts | 99.7% |
| Households with a broadband subscription | 94.8%±8.8 pts | 95.8% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Census Tract 521.21?
Owners occupy 87.4% of Census Tract 521.21's occupied homes and renters 12.6%. The median owner-occupied home is valued at $787,200 by its owner (±$57,934). The median renter pays $2,666 a month including utilities.
| Measure | Tract 521.21 | Silver Firs |
|---|---|---|
| Median home value (owner-occupied) | $787,200±$57,934 | $859,900 |
| Median gross rent | $2,666±$194 | $2,881 |
| Renters paying 35% or more of income on rent | 51.6%±44.0 pts | 40.1% |
| Median monthly owner costs, with a mortgage | $2,813±$254 | $2,985 |
| Owner-occupied homes | 87.4%±10.0 pts | 89.1% |
| Renter-occupied homes | 12.6%±10.0 pts | 10.9% |
| Housing units | 1,241±130 | 7,719 |
| Single-family detached homes | 94.2%±3.3 pts | 89.6% |
| Mobile homes | 0.7%±1.1 pts | 0.8% |
| Built 2020 or later | 1.0%±1.6 pts | 1.4% |
| Built 2010 to 2019 | 8.5%±5.2 pts | 8.3% |
| Built 1939 or earlier | 0.0%±3.2 pts | 1.1% |
| Households with no vehicle | 1.9%±2.2 pts | 2.2% |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Census Tract 521.21 get to work?
70.9% of Census Tract 521.21's workers drive alone and 22.7% work from home. The average trip to work takes 27.3 minutes.
| Measure | Tract 521.21 | Silver Firs |
|---|---|---|
| In the labor force (age 16+) | 80.2%±5.8 pts | 73.2% |
| Unemployment rate | 2.6%±2.0 pts | 3.0% |
| Drove alone to work | 70.9%±8.1 pts | 63.5% |
| Carpooled | 6.0%±2.8 pts | 6.3% |
| Public transportation | 0.4%±0.7 pts | 1.8% |
| Walked | 0.0%±1.7 pts | 0.4% |
| Worked from home | 22.7%±7.4 pts | 26.5% |
| Mean travel time to work | 27.3 min±2.2 | 31.7 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
How does Census Tract 521.21 compare with the other tracts in Snohomish County?
Among Snohomish County's tracts with a reliable estimate, Census Tract 521.21 ranks as shown below (1 = highest).
| Measure | In Snohomish County | In Silver Firs |
|---|---|---|
| Population | 138th of 173 | 4th of 6 |
| Residents per square mile | 93rd of 173 | 4th of 6 |
| Median household income | 10th of 173 | 2nd of 6 |
| Per capita income | 40th of 173 | 3rd of 6 |
| Median home value | 56th of 172 | 5th of 6 |
| Median gross rent | 28th of 166 | 5th of 5 |
| Bachelor's degree or higher | 83rd of 173 | 6th of 6 |
| Median age | 103rd of 173 | 4th of 6 |
| Owner-occupied share | 43rd of 173 | 4th of 6 |
The tracts next to it on Snohomish County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 521.12 | 7th | $200,365±$55,475 · within the margin of this tract |
| Tract 521.14 | 8th | $192,344±$25,136 · within the margin of this tract |
| Tract 519.31 | 9th | $183,341±$17,470 · within the margin of this tract |
| Tract 521.21 | 10th | $177,625±$33,246 |
| Tract 523.02 | 11th | $176,189±$25,298 · within the margin of this tract |
| Tract 521.22 | 12th | $175,450±$53,008 · within the margin of this tract |
| Tract 501.01 | 13th | $174,726±$17,504 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 521.21?
2 of the 18 figures for Census Tract 521.21 on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections