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Single Family ResidenceResidential
$494,277$327 / 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 93How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $500,000 on May 7, 2025

32018 UNION DR

BLACK DIAMOND, WA 98010
3
Beds
2
Baths
1,510 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.
0.17 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.

Valuation

$494K
$461K low$528K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$500,000 · May 7, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,505 (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.$509,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$164,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$345,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$517,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$509,000

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.0.17
HeatingThe type of heating system in the home.Electric
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.Porch · 60 ft²

Transaction History(6)

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

Foreclosure Filings(2)

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

E
Black Diamond Elementary SchoolA-
Elementary · Grades KG–5 · 0.8 mi
M
Thunder Mountain Middle SchoolA-
Middle · Grades 6–8 · 6.5 mi
H
Enumclaw High SchoolC
High · Grades 9–12 · 8.6 mi

District: Enumclaw School District

Neighborhood · ZIP 98010These 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.83
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.116
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.237

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.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.7%
PopulationHow many people live in this area.6,853
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.363 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$136,748
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$169,893
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.54 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

32018 Union Dr 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 90% of homes in Black Diamond 98010
  • Costs less per square foot than 85% of homes in King County
  • Smaller than 79% of homes in Black Diamond 98010
  • Older than 95% of homes in Black Diamond 98010

What homes are worth in Black Diamond 98010

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

This home
$394K$1.7M

This home is worth more than 10% of homes in Black Diamond 98010.

How it measures up in Black Diamond 98010

The dot is this home. The mark in the middle is the typical home in Black Diamond 98010.

Estimated value$494,277
CheaperTypical $755,536Pricier

Pricier than 10% of homes nearby

Price per ft²$327
CheaperTypical $355Pricier

Pricier than 40% of homes nearby

Living area1,510 ft²
SmallerTypical 2,270 ft²Bigger

Bigger than 21% of homes nearby

Lot size0.17 ac
SmallerTypical 0.17 acBigger

Bigger than 50% of homes nearby

Year built1922
OlderTypical 2008Newer

Newer than 5% of homes nearby

How 32018 Union Dr ranks against every home in each area.
MeasureThis homeBlack Diamond 98010King County
Estimated valuepricier than$494,27710% of homes15% of homes
Price per ft²pricier than$32740% of homes15% of homes
Living areabigger than1,510 ft²21% of homes35% of homes
Lot sizebigger than0.17 ac50% of homes36% of homes
Year builtnewer than19225% of homes7% of homes

About 32018 Union Dr

How much is 32018 Union Dr, Black Diamond, WA worth?

The TopHap Estimate for 32018 Union Dr, Black Diamond, WA is $494,277 as of Aug 30, 2026. The likely range is $460,638 to $527,916. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 32018 Union Dr, Black Diamond, WA last sell?

32018 Union Dr, Black Diamond, WA last sold on May 7, 2025 for $500,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 32018 Union Dr, Black Diamond, WA?

32018 Union Dr, Black Diamond, WA has 3 bedrooms, 2 bathrooms, 1,510 square feet of living space and a 0.17-acre lot.

When was 32018 Union Dr, Black Diamond, WA built?

32018 Union Dr, Black Diamond, WA was built in 1922, making it 104 years old. The building has 1 story.

What schools serve 32018 Union Dr, Black Diamond, WA?

32018 Union Dr, Black Diamond, WA is assigned to Black Diamond Elementary School (elementary), rated A-; Thunder Mountain Middle School (middle), rated A-; Enumclaw High School (high), rated C. All sit in Enumclaw School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 32018 Union Dr, Black Diamond, WA compare to other homes in Black Diamond 98010?

Among the 3,588 homes in Black Diamond 98010, it is worth more than 10% of them ($494,277 against a typical $755,536), its price per square foot is higher than 40% of them ($327 against a typical $355), it is bigger than 21% of them (1,510 ft² against a typical 2,270 ft²), its lot is bigger than 50% of them (0.17 ac against a typical 0.17 ac) and it is newer than 5% of them (1922 against a typical 2008). Measured against all of King County, it is worth more than 15% 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 32018 Union Dr, Black Diamond, WA?

The 2026 property tax bill for 32018 Union Dr, Black Diamond, WA was $4,505. The county assessed it at $509,000.

More homes on Union Dr

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More homes in Black Diamond 98010

Assigned schools

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