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Black Diamond

CityThe kind of area this report covers. Neighborhood areas nest inside each other, from broad districts down to small pockets.WashingtonStrong seller's market
Market temperatureA 0 to 100 score comparing this area with every similar area nationwide each month. 0 is the strongest buyer's market, 100 the strongest seller's market.Strong seller's market · 83
Buyer's marketBalancedSeller's market
$1.9M
Median sale priceThe middle sale price each month, counting normal open-market sales. The average runs above the median when a few expensive sales pull it up. Bars show how many homes sold.
+126.2%
1-yr changeHow much prices and sales counts changed since the same time last year, using a 3-month average to smooth out noise. Above the dashed line means growth.
303
Sales (12 mo)How many homes sold here in the last 12 months. More sales make the other numbers more reliable.
$729K
Median valueThe middle estimated value of all homes here, not just the ones that recently sold.

Deed records through Jul 2026Counties take time to publish deeds, so the newest months can be incomplete and may shift as more records arrive.

Market Trends

Market temperature (0–100)How the 0 to 100 market score moved over time. It blends price growth, sales pace, how often homes change hands, and seller profits.Temperature
20162018201920202022202320252026
Sale pricesThe middle sale price each month, counting normal open-market sales. The average runs above the median when a few expensive sales pull it up. Bars show how many homes sold.MedianSales
20162018201920202022202320252026
Growth (year over year)How much prices and sales counts changed since the same time last year, using a 3-month average to smooth out noise. Above the dashed line means growth.PriceSales
20162018201920202022202320252026
Price per square footThe middle price per square foot, for sales where the size is known. It adjusts for homes being different sizes.$/ft²
20162018201920202022202320252026
Sale premium vs estimated valueHow sale prices compare with our estimated values at the time of sale. Above the dashed line, homes sold for more than the models expected — a sign of competitive bidding. Below it, buyers paid under model value.Premium
20162018201920202022202320252026
Annual turnover (share of homes sold)The share of all homes here that sold in the trailing 12 months. Higher turnover means a more liquid market where homes trade hands more often.Turnover
20162018201920202022202320252026
Buyer mixWho is buying. Cash means no mortgage was recorded, investor means the buyer looked like an investor, and flip means the home resold within a year.CashInvestorFlip resale
20162018201920202022202320252026
Financing (share of purchase price)For buyers who borrowed: the middle share of the price they financed, and the middle share they paid up front.Loan (LTV)Down payment
20162018201920202022202320252026
Sellers who sold at a gainThe share of sellers each month who sold for more than they originally paid.Sold at gain
20162018201920202022202320252026
Typical hold before sellingThe middle number of years sellers owned their home before selling.Median hold
20162018201920202022202320252026
Median annualized return at resaleThe middle yearly gain sellers earned, spread across the years they owned the home. Only counts homes held at least a year.Annualized gain
20162018201920202022202320252026
Preforeclosure filingsForeclosure notices filed each month. A rise can be an early sign that more owners are struggling. Auction stage counts the filings that reached a scheduled foreclosure auction.FilingsAuction stage
20162017201920202022202420252026

Housing Stock

HomesHow many homes we have records for in this area.3,523
Median value (AVM)The middle estimated value of all homes here, not just the ones that recently sold.$729K
Median sizeThe middle home size here, measured in square feet.2,250 ft²
Median bedroomsThe middle bedroom count for homes here.3
Median year builtThe middle build year for homes here. A recent year means most housing is newer.2007
Single familyThe share of homes here that are single-family houses.85%
CondosThe share of homes here that are condos.1.2%

Equity & Ownership

Equity rich (LTV ≤ 50%)The share of owners who owe half or less of what their home is worth, meaning they hold a lot of equity.43%
Underwater (LTV ≥ 125%)The share of owners who owe at least 25% more than their home is worth.1.2%
Owner occupiedThe share of homes lived in by their owner rather than rented out or left empty.62%
Company ownedThe share of homes owned by a company or trust instead of a person.26%
Median loan-to-valueThe middle share of home value still owed on loans across all owners here.59%
Typical ownership tenureHow long the typical owner here has held their home.6.5 yrs

CommunityThese 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.102
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.115
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.240

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.37%
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.4,897
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.748 / mi²
Median household incomeThe middle household income here — half of households earn more, half earn less.$129K
Average household incomeThe average household income. It runs higher than the median when a few high earners pull it up.$161K
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.53 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.43%

Market metrics are derived from recorded arms-length deeds and refreshed nightly. Temperature blends price momentum, sales velocity, turnover and resale outcomes, ranked against all citys nationally.

How Black Diamond compares

By median home value, Black Diamond is the 23rd most expensive of 36 cities in King County, and its typical home is worth more than 40% of all homes in King County.

Home values in Black Diamond

Share of homes at each estimated value.

Median
$370K$1.8M
cities in King County ranked by median home value
#King CountyMedian valueHomes
1Medina$4.4M1,165
2Hunts Point$4.3M179
3Yarrow Point$4M283
4Clyde Hill$3.6M1,064
5Mercer Island$2.2M8,125
6Sammamish$1.5M21,494
7Bellevue$1.4M42,599
8Newcastle$1.4M3,930
9Redmond$1.3M25,487
10Woodinville$1.3M12,580
11Kirkland$1.2M32,140
12Issaquah$1.1M14,911
13North Bend$1.1M5,775
14Normandy Park$1.1M2,362
15Kenmore$1M7,791
16Carnation$1M2,902
17Snoqualmie$1M5,302
18Lake Forest Park$1M4,875
19Duvall$955K4,672
20Seattle$828K225,693
21Maple Valley$801K12,428
22Shoreline$799K18,083
23Black Diamond$729K3,523
24Renton$699K41,394

36 cities in King County are ranked; the most valuable are listed here.

About the Black Diamond market

What is the median home price in Black Diamond, WA?

The median sale price in Black Diamond, WA is $1,854,356 (data through July 2026), based on deeds recorded with the county. That is up 126.2% from a year earlier.

How many homes sell in Black Diamond, WA each year?

303 homes sold in Black Diamond, WA over the last 12 months (data through July 2026). TopHap counts recorded arm's-length deeds, not listings, so the figure is not affected by which brokerage handled the sale.

Is Black Diamond, WA a buyer's or seller's market?

Black Diamond, WA is currently a strong seller's market, scoring 83 out of 100 on TopHap's market temperature index (data through July 2026). The score weighs sales velocity and price direction; above 60 favours sellers, below 40 favours buyers.

How many homes are there in Black Diamond, WA?

Black Diamond, WA contains 3,523 residential properties, with a median of 2,250 square feet, 3 bedrooms, built around 2007. The median TopHap Estimate is $729K.

How does Black Diamond, WA compare to the rest of King County?

By median home value, Black Diamond, WA is the 23rd most expensive of 36 cities in King County. Its typical home is worth more than 40% of all homes in King County. Shoreline ranks just above it and Renton just below. The ranking is rebuilt nightly from the county assessor record of every home in each area.

Do people own or rent in Black Diamond, WA?

62% of homes in Black Diamond, WA are owner-occupied. 26% are held by a company rather than an individual.

How much equity do owners in Black Diamond, WA hold?

43% of mortgaged homes in Black Diamond, WA are equity-rich, meaning the loan balance is under half the home's value. 1.2% owe more than the home is worth.

Nearby markets

Browse addresses

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Explore Black Diamond on the map

See every recorded sale, price heat map, school zone and flood overlay across Black Diamond in TopHap’s interactive 3D map.

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