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Single Family ResidenceResidential
$1,222,004$867 / 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 78How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $985,000 on Jul 31, 2009

15431 WESTSIDE HWY SW

VASHON, WA 98070
4
Beds
1
Baths
1,410 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.
9.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1922
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.2M
$951K low$1.5M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$985,000 · Jul 31, 2009

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,641 (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.$862,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$389,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$473,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$840,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$862,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyKING
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
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.ElevatorPorch · 320 ft²

Transaction History(3)

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.

M
McMurray Middle SchoolA
Middle · Grades 6–8 · 3.3 mi
E
Chautauqua Elementary SchoolA-
Elementary · Grades PK–5 · 3.4 mi
H
Vashon Island High SchoolA+
High · Grades 9–12 · 3.5 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

15431 Westside Hwy 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 more than 85% of homes in Vashon North
  • Costs more per square foot than 97% of homes in Vashon North
  • Smaller than 69% of homes in King County
  • Has a bigger lot than 97% of homes in King County
  • Older than 93% of homes in King County

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
$402K$2.1M

This home is worth more than 79% 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$1,222,004
CheaperTypical $929,593Pricier

Pricier than 79% of homes nearby

Price per ft²$867
CheaperTypical $536Pricier

Pricier than 92% of homes nearby

Living area1,410 ft²
SmallerTypical 1,790 ft²Bigger

Bigger than 32% of homes nearby

Lot size9.23 ac
SmallerTypical 1 acBigger

Bigger than 94% of homes nearby

Year built1922
OlderTypical 1972Newer

Newer than 14% of homes nearby

How 15431 Westside Hwy Sw ranks against every home in each area.
MeasureThis homeVashon NorthVashon 98070King County
Estimated valuepricier than$1,222,00485% of homes79% of homes73% of homes
Price per ft²pricier than$86797% of homes92% of homes94% of homes
Living areabigger than1,410 ft²36% of homes32% of homes31% of homes
Lot sizebigger than9.23 ac95% of homes94% of homes97% of homes
Year builtnewer than192215% of homes14% of homes7% of homes

About 15431 Westside Hwy Sw

How much is 15431 Westside Hwy Sw, Vashon, WA worth?

The TopHap Estimate for 15431 Westside Hwy Sw, Vashon, WA is $1,222,004 as of Oct 21, 2026. The likely range is $951,293 to $1,492,715. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 15431 Westside Hwy Sw, Vashon, WA last sell?

15431 Westside Hwy Sw, Vashon, WA last sold on Jul 31, 2009 for $985,000, according to the county's recorded deed.

How big is 15431 Westside Hwy Sw, Vashon, WA?

15431 Westside Hwy Sw, Vashon, WA has 4 bedrooms, 1 bathrooms and 1,410 square feet of living space.

When was 15431 Westside Hwy Sw, Vashon, WA built?

15431 Westside Hwy Sw, Vashon, WA was built in 1922, making it 104 years old. The building has 1 story.

What schools serve 15431 Westside Hwy Sw, Vashon, WA?

15431 Westside Hwy Sw, Vashon, WA is assigned to McMurray Middle School (middle), rated A; Chautauqua Elementary School (elementary), rated A-; Vashon Island High School (high), rated A+. All sit in Vashon Island School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 15431 Westside Hwy Sw, Vashon, WA compare to other homes in Vashon 98070?

Among the 5,183 homes in Vashon 98070, it is worth more than 79% of them ($1,222,004 against a typical $929,593), its price per square foot is higher than 92% of them ($867 against a typical $536), it is bigger than 32% of them (1,410 ft² against a typical 1,790 ft²), its lot is bigger than 94% of them (9.23 ac against a typical 1 ac) and it is newer than 14% of them (1922 against a typical 1972). Measured against all of King County, it is worth more than 73% 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 15431 Westside Hwy Sw, Vashon, WA?

The 2026 property tax bill for 15431 Westside Hwy Sw, Vashon, WA was $9,641. The county assessed it at $862,000.

More homes on Westside Hwy Sw

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Assigned schools

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