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Advertise here →Black Diamond, WA · Houses & Market Data
Black Diamond, Washington houses and real estate market data.
Houses in Black Diamond, WA (King County) — Census median home value $776,400, county listing prices down about 4.0% over the past year. Market data for Black Diamond houses and the broader area.
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Black Diamond, WA is in King County, Washington — this guide covers houses in Black Diamond and the whole local market: resale homes, condos, land, and new construction. The most recent Census estimate puts the population at 5,678, with a median household income of $144,728. Census data puts Black Diamond houses at a median value of $776,400 (all owner-occupied homes); King County's current median listing price runs $850,000, down about 4.0% over the past year.
Info from government sites and builders may have provided source info.
Market overview
Black Diamond housing market
Black Diamond is in King County, Washington. Manifest Census and county price-trend data provide baseline context for houses in Black Diamond and the surrounding county market.
Median home value (Census ACS)
$776,400
Population (Census ACS)
5,678
Median household income
$144,728
County price trend (2025)
0.89% YoY
Population, income, and median home value from the project batch manifest (Census ACS 2023 5-year). County price trend from FHFA county HPI when present in the manifest row.
At a glance
Black Diamond market snapshot
Population
5,678
County
King County
Median Household Income
$144,728
Median Home Value (city)
$776,400
Median Listing Price (King County)
$850,000
Median Gross Rent
$2,340/mo
Price Trend (YoY)
-4.0%
Market data compiled from public sources; deemed reliable but not guaranteed; verify independently. See About
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What makes Black Diamond different
Home Value, By Source
The Census Bureau's American Community Survey (2023 5-year estimate) puts Black Diamond's median home value — across all owner-occupied homes, not just recent sales — at $776,400. Separately, King County's current median listing price (via Realtor.com data, 2026-06-01) runs $850,000. These cover different geography (city vs. county) and different measures (assessed value vs. active listings), which is why we show both rather than picking one — full source list on our data sources page.
County Price Trend
King County's FHFA house price index shows a 0.89% annual change in 2025.
Population & Income
Black Diamond has an estimated population of 5,678 and a median household income of $144,728, per the Census Bureau's American Community Survey (2023 5-year estimate).
Affordability Snapshot
Black Diamond's Census-reported median home value works out to about 5.4x the area's median household income, and median gross rent runs roughly 19% of that same income on an annualized basis. Housing economists commonly flag a price-to-income ratio above 4x as historically elevated -- useful context, not a personal affordability verdict.
Nearby
Places around Black Diamond
County guide: King County — cities, market context, and local resources for the county that includes Black Diamond.
USAHouses.com also helps visitors looking in nearby King County and other Washington communities. Some locations may not yet have dedicated pages, but many licensed professionals in this region assist surrounding communities.
Nearby communities include Ravensdale, Maple Valley, Lake Morton-Berrydale, Lake Holm, Covington, Hobart, Shadow Lake, Enumclaw, Auburn, Maple Heights-Lake Desire, Mirrormont, Kent, Fairwood, Algona, East Renton Highlands, Pacific.
Ravensdale market data
Nearby city · ~3.7 mi
Maple Valley market data
Nearby city · ~3.7 mi
Lake Morton-Berrydale market data
Nearby city · ~4.2 mi
Lake Holm market data
Nearby city · ~5.3 mi
Covington market data
Nearby city · ~5.3 mi
Hobart market data
Nearby city · ~6.7 mi
Shadow Lake market data
Nearby city · ~7.0 mi
Enumclaw market data
Nearby city · ~7.9 mi
Auburn market data
Nearby city · ~9.0 mi
Maple Heights-Lake Desire market data
Nearby city · ~9.1 mi
Mirrormont market data
Nearby city · ~10.1 mi
Kent market data
Nearby city · ~10.4 mi
Fairwood market data
Nearby city · ~10.8 mi
Algona market data
Nearby city · ~11.1 mi
East Renton Highlands market data
Nearby city · ~11.5 mi
Pacific market data
Nearby city · ~11.6 mi
More Washington cities with market guides: Tacoma, Vancouver, Everett, Yakima, Bellingham, Kennewick, Pasco, Marysville.
Tacoma market data
Same-state city guide
Vancouver market data
Same-state city guide
Everett market data
Same-state city guide
Yakima market data
Same-state city guide
Bellingham market data
Same-state city guide
Kennewick market data
Same-state city guide
Pasco market data
Same-state city guide
Marysville market data
Same-state city guide
Adjacent-county Census places with USAHouses.com pages: Lake Tapps (~9.2 mi), Bonney Lake (~10.5 mi), Buckley (~10.5 mi), Sumner (~11.9 mi), Prairie Heights (~12.2 mi), South Prairie (~12.9 mi), Prairie Ridge (~13.1 mi), Alderton (~13.6 mi), Edgewood (~13.8 mi), North Puyallup (~14.6 mi), Wilkeson (~14.8 mi), Tehaleh (~15.7 mi), Fife Heights (~15.8 mi), Puyallup (~15.9 mi), Carbonado (~16.1 mi), Crocker (~16.3 mi).
New construction: New homes near Black Diamond (Seattle) · New homes near Black Diamond (Spokane) · Washington new construction.
Census & home facts
Black Diamond data from published sources
Population (ACS 2023)
5,678
Median home value (ACS 2023)
$776,400
Median household income (ACS 2023)
$144,728
Median gross rent (ACS 2023)
$2,340
County FHFA annual change (2025)
0.89%
County median listing price (FRED/Realtor.com) (2026-06-01)
$850,000
Census place type
city
County
King County
Land area (Census Gazetteer 2024)
6.60 sq mi
Census GEOID
5306330
Census ACS, FHFA, and FRED figures are labeled with the year present in existing CSVs. Subject to change / confirm locally.
NewUSAHouses.com communities
Closest verified new-home communities near Black Diamond
Availability and pricing are controlled by the builder and may change; confirm with the builder.
The Highlands at Black Diamond ↗
Pulte · Black Diamond, Washington · ~0.6 mi
Mainvue At Ten Trails ↗
MainVue Homes · Black Diamond, Washington · ~0.8 mi
Ten Trails ↗
Richmond American Homes · Black Diamond, Washington · ~0.8 mi
Ten Trails - Mountain View ↗
Lennar · Black Diamond, Washington · ~0.9 mi · from $454,950
Regency at Ten Trails - Eclipse Collection ↗
Toll Brothers · Black Diamond, Washington · ~1.0 mi · from $624,995
Local life
Life in Black Diamond
Schools
Seattle School District No. 1 — 109 schools, 51,238 students enrolled, per the U.S. Department of Education's Common Core of Data. King addresses may be served by Seattle School District No. 1, but attendance zones vary by street — confirm assigned schools with the district before making a move.
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Common questions
Black Diamond FAQ
What are houses worth in Black Diamond, WA?
The Census Bureau's American Community Survey puts the median value of houses in Black Diamond at $776,400. King County's current median listing price runs $850,000, down about 4.0% over the past year.
How much do houses cost in Black Diamond, WA?
For owner-occupied houses in Black Diamond, Census ACS data shows a median value of $776,400. Active listing prices in King County may differ — see the market snapshot above.
What types of houses are in Black Diamond, WA?
Black Diamond houses include resale single-family homes, condos, mobile homes, and small multi-unit buildings, plus new construction in surrounding King County communities where builders are active. The housing-stock section below uses Census ACS structure counts when available for this city.
What is the population of Black Diamond, WA?
The U.S. Census Bureau's American Community Survey (2023 5-year estimate) puts Black Diamond's population at approximately 5,678.
What's the median rent in Black Diamond, WA?
The Census ACS estimates median gross rent in Black Diamond at approximately $2,340 per month.
What is the median household income in Black Diamond, WA?
Census ACS data puts the median household income in Black Diamond at approximately $144,728.
Is the Black Diamond housing market growing?
King County's FHFA house price index shows a 0.89% annual change in 2025.
Is Black Diamond, WA affordable relative to income?
Census ACS data puts Black Diamond's median home value at about 5.4 times the median household income, with median gross rent equal to roughly 19% of that income annually. This is a general benchmark, not a personal pre-qualification -- your own income, debt, and down payment determine what you can actually afford.
What school district serves Black Diamond, WA?
Manifest and public school-directory data suggest Seattle School District No. 1 for many Black Diamond addresses, but attendance zones vary by street — verify your assigned schools with the district before making a move.
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