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Single Family ResidenceResidential
$570,119$313 / 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 98How 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

8428 S 121ST ST

SEATTLE, WA 98178
3
Beds
1
Baths
1,820 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.
0.14 ac
Lot SizeThe size of the land the home sits on, from county records.
1958
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$570K
$560K low$580K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$503 (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.$569,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$266,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$303,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$585,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$569,000

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.0.14
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, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No

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

E
Bryn Mawr Elementary SchoolD+
Elementary · Grades KG–5 · 0.3 mi
M
Dimmitt Middle SchoolD-
Middle · Grades 6–8 · 0.3 mi
H
Renton High SchoolD
High · Grades 9–12 · 1.1 mi

District: Renton School District

Neighborhood · ZIP 98178These 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.88
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.113
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.285

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.24%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.12%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.26,556
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,215 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$96,863
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$135,182
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.38 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

8428 S 121st St 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 84% of homes in Bryn Mawr
  • Costs less per square foot than 90% of homes in King County
  • Has a smaller lot than 83% of homes in Seattle 98178
  • Older than 73% of homes in King County

What homes are worth in Seattle 98178

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

This home
$311K$1.3M

This home is worth more than 33% of homes in Seattle 98178.

How it measures up in Seattle 98178

The dot is this home. The mark in the middle is the typical home in Seattle 98178.

Estimated value$570,119
CheaperTypical $637,116Pricier

Pricier than 33% of homes nearby

Price per ft²$313
CheaperTypical $374Pricier

Pricier than 22% of homes nearby

Living area1,820 ft²
SmallerTypical 1,770 ft²Bigger

Bigger than 53% of homes nearby

Lot size0.14 ac
SmallerTypical 0.17 acBigger

Bigger than 17% of homes nearby

Year built1958
OlderTypical 1955Newer

Newer than 59% of homes nearby

How 8428 S 121st St ranks against every home in each area.
MeasureThis homeBryn MawrSeattle 98178King County
Estimated valuepricier than$570,11916% of homes33% of homes21% of homes
Price per ft²pricier than$31315% of homes22% of homes10% of homes
Living areabigger than1,820 ft²43% of homes53% of homes49% of homes
Lot sizebigger than0.14 ac18% of homes17% of homes26% of homes
Year builtnewer than195866% of homes59% of homes27% of homes

About 8428 S 121st St

How much is 8428 S 121st St, Seattle, WA worth?

The TopHap Estimate for 8428 S 121st St, Seattle, WA is $570,119 as of Oct 21, 2026. The likely range is $560,017 to $580,221. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 8428 S 121st St, Seattle, WA last sell?

8428 S 121st St, Seattle, WA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 8428 S 121st St, Seattle, WA?

8428 S 121st St, Seattle, WA has 3 bedrooms, 1 bathrooms, 1,820 square feet of living space and a 0.14-acre lot.

When was 8428 S 121st St, Seattle, WA built?

8428 S 121st St, Seattle, WA was built in 1958, making it 68 years old. The building has 1 story.

What schools serve 8428 S 121st St, Seattle, WA?

8428 S 121st St, Seattle, WA is assigned to Bryn Mawr Elementary School (elementary), rated D+; Dimmitt Middle School (middle), rated D-; Renton High School (high), rated D. All sit in Renton School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 8428 S 121st St, Seattle, WA compare to other homes in Seattle 98178?

Among the 7,751 homes in Seattle 98178, it is worth more than 33% of them ($570,119 against a typical $637,116), its price per square foot is higher than 22% of them ($313 against a typical $374), it is bigger than 53% of them (1,820 ft² against a typical 1,770 ft²), its lot is bigger than 17% of them (0.14 ac against a typical 0.17 ac) and it is newer than 59% of them (1958 against a typical 1955). Measured against all of King County, it is worth more than 21% 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 8428 S 121st St, Seattle, WA?

The 2026 property tax bill for 8428 S 121st St, Seattle, WA was $503. The county assessed it at $569,000.

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