Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$1,771,297$476 / 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 95How 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 $700,000 on Oct 23, 2009

9921 171ST AVE SE

RENTON, WA 98059
4
Beds
3.5
Baths
3,720 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.
0.51 ac
Lot SizeThe size of the land the home sits on, from county records.
1999
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.8M
$1.7M low$1.9M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$700,000 · Oct 23, 2009

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,878 (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.$1,566,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$817,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$749,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,477,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,566,000

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.0.51
HeatingThe type of heating system in the home.Heat Pump
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 780 ft²ElevatorPorch · 100 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
Cougar Mountain Middle SchoolA
Middle · Grades 6–8 · 1.3 mi
E
Newcastle Elementary SchoolA+
Elementary · Grades KG–5 · 2.0 mi
H
Liberty High SchoolA+
High · Grades 9–12 · 2.5 mi

District: Issaquah School District

Neighborhood · ZIP 98059These 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.52
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 100.270

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.32%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.42,159
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,108 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$141,350
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$174,825
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.50 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.43%

Owner Tools

Do you own this home?
Claim this home

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

9921 171st Ave Se 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 92% of homes in Fairfield (Coalfield)
  • Costs more per square foot than 69% of homes in Renton 98059
  • Bigger than 93% of homes in Renton 98059
  • Has a bigger lot than 78% of homes in King County
  • Newer than 87% of homes in Fairfield (Coalfield)

What homes are worth in Renton 98059

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

This home
$330K$2.4M

This home is worth more than 92% of homes in Renton 98059.

How it measures up in Renton 98059

The dot is this home. The mark in the middle is the typical home in Renton 98059.

Estimated value$1,771,297
CheaperTypical $911,872Pricier

Pricier than 92% of homes nearby

Price per ft²$476
CheaperTypical $435Pricier

Pricier than 69% of homes nearby

Living area3,720 ft²
SmallerTypical 2,220 ft²Bigger

Bigger than 93% of homes nearby

Lot size0.51 ac
SmallerTypical 0.24 acBigger

Bigger than 77% of homes nearby

Year built1999
OlderTypical 1992Newer

Newer than 59% of homes nearby

How 9921 171st Ave Se ranks against every home in each area.
MeasureThis homeFairfield (Coalfield)Renton 98059King County
Estimated valuepricier than$1,771,29792% of homes92% of homes88% of homes
Price per ft²pricier than$47650% of homes69% of homes44% of homes
Living areabigger than3,720 ft²88% of homes93% of homes93% of homes
Lot sizebigger than0.51 ac45% of homes77% of homes78% of homes
Year builtnewer than199987% of homes59% of homes76% of homes

About 9921 171st Ave Se

How much is 9921 171st Ave Se, Renton, WA worth?

The TopHap Estimate for 9921 171st Ave Se, Renton, WA is $1,771,297 as of Sep 24, 2026. The likely range is $1,680,362 to $1,862,232. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9921 171st Ave Se, Renton, WA last sell?

9921 171st Ave Se, Renton, WA last sold on Oct 23, 2009 for $700,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 9921 171st Ave Se, Renton, WA?

9921 171st Ave Se, Renton, WA has 4 bedrooms, 3.5 bathrooms, 3,720 square feet of living space and a 0.51-acre lot.

When was 9921 171st Ave Se, Renton, WA built?

9921 171st Ave Se, Renton, WA was built in 1999, making it 27 years old. The building has 2 stories.

What schools serve 9921 171st Ave Se, Renton, WA?

9921 171st Ave Se, Renton, WA is assigned to Cougar Mountain Middle School (middle), rated A; Newcastle Elementary School (elementary), rated A+; Liberty High School (high), rated A+. All sit in Issaquah School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 9921 171st Ave Se, Renton, WA compare to other homes in Renton 98059?

Among the 12,474 homes in Renton 98059, it is worth more than 92% of them ($1,771,297 against a typical $911,872), its price per square foot is higher than 69% of them ($476 against a typical $435), it is bigger than 93% of them (3,720 ft² against a typical 2,220 ft²), its lot is bigger than 77% of them (0.51 ac against a typical 0.24 ac) and it is newer than 59% of them (1999 against a typical 1992). Measured against all of King County, it is worth more than 88% 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 9921 171st Ave Se, Renton, WA?

The 2026 property tax bill for 9921 171st Ave Se, Renton, WA was $15,878. The county assessed it at $1,566,000.

More homes on 171st Ave Se

Closest homes

More homes in Renton 98059

Assigned schools

Explore the area

See this home in context

Open 9921 171st Ave Se on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map