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Single Family ResidenceResidential
$696,983$346 / 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 90How 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 $678,905 on Oct 2, 2025

9901 MASON ST SW

OLYMPIA, WA 98512
3
Beds
2 / 1
Baths
2,016 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.
0.5 ac
Lot SizeThe size of the land the home sits on, from county records.
1972
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

$697K
$627K low$766K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$678,905 · Oct 2, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$90 (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.$418,200 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$166,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$251,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$414,600
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$418,200

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.8
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
28
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
11
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.minimal

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
StyleThe architectural style of the home, such as ranch or colonial.Split Entry
CountyThurston
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1991
Lot (acres)The size of the land the home sits on, from county records.0.50
ConstructionThe main material the home's frame and walls are built from.Wood Frame
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Block (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Baseboard
CoolingThe type of cooling or air conditioning in the home.Yes
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 276 ft²Patio · 252 ft²Porch · 24 ft²

Transaction History(2)

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
Littlerock Elementary SchoolB-
Elementary · Grades KG–5 · 3.0 mi
M
George Bush Middle SchoolB+
Middle · Grades 6–8 · 4.9 mi
H
Tumwater High SchoolA-
High · Grades 9–12 · 5.8 mi

District: Tumwater School District

Neighborhood · ZIP 98512These 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.93
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 100.226

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.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.7%
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.33,679
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.$90,265
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$107,298
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.65 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.35%

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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

9901 Mason St 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 81% of homes in Thurston County
  • Costs more per square foot than 73% of homes in Olympia 98512
  • Bigger than 65% of homes in Thurston County
  • Has a bigger lot than 67% of homes in Thurston County
  • Older than 80% of homes in Olympia 98512

What homes are worth in Olympia 98512

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

This home
$260K$1.1M

This home is worth more than 80% of homes in Olympia 98512.

How it measures up in Olympia 98512

The dot is this home. The mark in the middle is the typical home in Olympia 98512.

Estimated value$696,983
CheaperTypical $554,362Pricier

Pricier than 80% of homes nearby

Price per ft²$346
CheaperTypical $301Pricier

Pricier than 73% of homes nearby

Living area2,016 ft²
SmallerTypical 1,792 ft²Bigger

Bigger than 62% of homes nearby

Lot size0.5 ac
SmallerTypical 0.39 acBigger

Bigger than 54% of homes nearby

Year built1972
OlderTypical 1989Newer

Newer than 20% of homes nearby

How 9901 Mason St Sw ranks against every home in each area.
MeasureThis homeOlympia 98512Thurston County
Estimated valuepricier than$696,98380% of homes81% of homes
Price per ft²pricier than$34673% of homes73% of homes
Living areabigger than2,016 ft²62% of homes65% of homes
Lot sizebigger than0.5 ac54% of homes67% of homes
Year builtnewer than197220% of homes22% of homes

About 9901 Mason St Sw

How much is 9901 Mason St Sw, Olympia, WA worth?

The TopHap Estimate for 9901 Mason St Sw, Olympia, WA is $696,983 as of Sep 24, 2026. The likely range is $627,470 to $766,496. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9901 Mason St Sw, Olympia, WA last sell?

9901 Mason St Sw, Olympia, WA last sold on Oct 2, 2025 for $678,905, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 9901 Mason St Sw, Olympia, WA?

9901 Mason St Sw, Olympia, WA has 3 bedrooms, 2 bathrooms, 2,016 square feet of living space and a 0.50-acre lot.

When was 9901 Mason St Sw, Olympia, WA built?

9901 Mason St Sw, Olympia, WA was built in 1972, making it 54 years old. It is a split entry home. The building has 1 story.

What schools serve 9901 Mason St Sw, Olympia, WA?

9901 Mason St Sw, Olympia, WA is assigned to Littlerock Elementary School (elementary), rated B-; George Bush Middle School (middle), rated B+; Tumwater High School (high), rated A-. All sit in Tumwater School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 9901 Mason St Sw, Olympia, WA compare to other homes in Olympia 98512?

Among the 11,196 homes in Olympia 98512, it is worth more than 80% of them ($696,983 against a typical $554,362), its price per square foot is higher than 73% of them ($346 against a typical $301), it is bigger than 62% of them (2,016 ft² against a typical 1,792 ft²), its lot is bigger than 54% of them (0.5 ac against a typical 0.39 ac) and it is newer than 20% of them (1972 against a typical 1989). Measured against all of Thurston County, it is worth more than 81% 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 9901 Mason St Sw, Olympia, WA?

The 2026 property tax bill for 9901 Mason St Sw, Olympia, WA was $90. The county assessed it at $418,200.

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