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Single Family ResidenceResidential
$653,073$371 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 92How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $183,000 on Nov 19, 1999

20521 87TH AVE SW

VASHON, WA 98070
2
Beds
1.8
Baths
1,760 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.34 ac
Lot SizeThe size of the land the home sits on, from county records.
1978
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$653K
$599K low$707K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$183,000 · Nov 19, 1999

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,711 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$589,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$142,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$447,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$609,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$589,000

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.48
59
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
24
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
43
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
95
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
23
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.14 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.0.2 percent flood zone

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyKING
Lot (acres)The size of the land the home sits on, from county records.0.34
HeatingThe type of heating system in the home.Electric
GarageWhether the property has a garage, and details like whether it is attached to the home.Carport (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 220 ft²

Transaction History(1)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Chautauqua Elementary SchoolA-
Elementary · Grades PK–5 · 0.6 mi
H
Vashon Island High SchoolA
High · Grades 9–12 · 0.7 mi
M
McMurray Middle SchoolA
Middle · Grades 6–8 · 0.7 mi

District: Vashon Island School District

Neighborhood · ZIP 98070These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.152
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.263

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.83%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.10%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.11,184
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.225 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$106,056
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$140,428
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.43%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

20521 87th Ave Sw measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth less than 85% of homes in Vashon 98070
  • Costs less per square foot than 91% of homes in Vashon 98070
  • Has a smaller lot than 80% of homes in Vashon 98070

What homes are worth in Vashon 98070

Each bar is how many homes fall in that price range. The marker is this home.

This home
$430K$2.2M

This home is worth more than 15% of homes in Vashon 98070.

How it measures up in Vashon 98070

The dot is this home. The mark in the middle is the typical home in Vashon 98070.

Estimated value$653,073
CheaperTypical $938,402Pricier

Pricier than 15% of homes nearby

Price per ft²$371
CheaperTypical $535Pricier

Pricier than 9% of homes nearby

Living area1,760 ft²
SmallerTypical 1,780 ft²Bigger

Bigger than 49% of homes nearby

Lot size0.34 ac
SmallerTypical 1 acBigger

Bigger than 20% of homes nearby

Year built1978
OlderTypical 1972Newer

Newer than 58% of homes nearby

How 20521 87th Ave Sw ranks against every home in each area.
MeasureThis homeVashon NorthVashon 98070King County
Estimated valuepricier than$653,07323% of homes15% of homes30% of homes
Price per ft²pricier than$37111% of homes9% of homes21% of homes
Living areabigger than1,760 ft²52% of homes49% of homes46% of homes
Lot sizebigger than0.34 ac22% of homes20% of homes71% of homes
Year builtnewer than197864% of homes58% of homes50% of homes

About 20521 87th Ave Sw

How much is 20521 87th Ave Sw, Vashon, WA worth?

The TopHap Estimate for 20521 87th Ave Sw, Vashon, WA is $653,073 as of Sep 24, 2026. The likely range is $598,913 to $707,233. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20521 87th Ave Sw, Vashon, WA last sell?

20521 87th Ave Sw, Vashon, WA last sold on Nov 19, 1999 for $183,000, according to the county's recorded deed.

How big is 20521 87th Ave Sw, Vashon, WA?

20521 87th Ave Sw, Vashon, WA has 2 bedrooms, 1.8 bathrooms, 1,760 square feet of living space and a 0.34-acre lot.

When was 20521 87th Ave Sw, Vashon, WA built?

20521 87th Ave Sw, Vashon, WA was built in 1978, making it 48 years old. The building has 2 stories.

What schools serve 20521 87th Ave Sw, Vashon, WA?

20521 87th Ave Sw, Vashon, WA is assigned to Chautauqua Elementary School (elementary), rated A-; Vashon Island High School (high), rated A; McMurray Middle School (middle), rated A. All sit in Vashon Island School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20521 87th Ave Sw, Vashon, WA compare to other homes in Vashon 98070?

Among the 5,181 homes in Vashon 98070, it is worth more than 15% of them ($653,073 against a typical $938,402), its price per square foot is higher than 9% of them ($371 against a typical $535), it is bigger than 49% of them (1,760 ft² against a typical 1,780 ft²), its lot is bigger than 20% of them (0.34 ac against a typical 1 ac) and it is newer than 58% of them (1978 against a typical 1972). Measured against all of King County, it is worth more than 30% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 20521 87th Ave Sw, Vashon, WA?

The 2026 property tax bill for 20521 87th Ave Sw, Vashon, WA was $6,711. The county assessed it at $589,000.

More homes on 87th Ave Sw

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