Housing data for Black Diamond, WA
Black Diamond, WA has an estimated 5,961 residents and 2,442 homes (US Census Bureau, 2020–2024 American Community Survey).
It is a city in King County.
14.0% of households rent.
The median gross rent is $1,453 a month.
Its population grew measurably since 2015–2019 (+33.2%).
Figures last updated on .
- Residents
- 5,961 (±26)
- Housing units
- 2,442 (±157)
- Households that rent
- 14.0%
- Median gross rent
- $1,453
- Residents since 2015–2019
- +33.2%
What stands out in Black Diamond
Homes in buildings of 5 or more units: 3.8% (±3.9 points) in Black Diamond, lower than in King County (37.6%).
Households that rent: 14.0% (±5.4 points) in Black Diamond, lower than in King County (44.6%).
Households without a vehicle: 3.5% (±3.5 points) in Black Diamond, lower than in King County (11.2%).
Commuting by public transportation: 0.2% (±0.5 points) in Black Diamond, lower than in King County (6.8%).
Housing in Black Diamond at a glance
- Median rent: $1,453 median gross rent a month (Small sample: wide margin of error)
- Rent by bedrooms: $1,140 median gross rent, 2 bedrooms
- Rent burden: 26.4% of renters pay 30% or more of income (Small sample: wide margin of error)
- Renters and owners: 14.0% of households rent
- Income and affordability: $141,383 median household income
- Home values: $779,100 median home value
- Homeowner costs: $3,068 median monthly cost with a mortgage
- Property taxes: $5,753 median real estate taxes a year
- Types of homes: 3.8% of homes are in buildings of 5 or more units
- Bedrooms: 81.0% of homes have 3 or more bedrooms
- Age of homes: 18.8% of homes were built before 1980
- Vacancy rate: 0.0% rental vacancy rate (Small sample: wide margin of error)
- Heating fuel: 65.6% heat with utility gas
- Commute and cars: 37.5 minutes average trip to work
- Crime reported to police: 41 violent crimes per 100,000 residents
- Growth: +33.2% residents since 2015–2019
- How long people stay: 41.6% moved in since 2020
- Crowding and facilities: 3.5% of homes have more than 1 person per room
- Fair Market Rent: $2,590 Small Area FMR, 2 bedrooms (ZIP 98010)
Black Diamond against King County, its state and the nation
| Black Diamond | King County | Washington | United States | |
|---|---|---|---|---|
| Residents | 5,961 (±26) | 2,287,171 (exact) | 7,816,116 (exact) | 334,922,499 |
| Housing units | 2,442 (±157) | 1,003,284 (±329) | 3,306,620 (±517) | 143,775,355 |
| Households that rent | 14.0% (±5.4 points) | 44.6% (±0.4 points) | 36.2% (±0.3 points) | 34.8% |
| Median gross rent | $1,453 (±$1,098) | $2,092 (±$13) | $1,760 (±$7) | $1,413 |
| Median household income | $141,383 (±$13,982) | $124,746 (±$968) | $98,141 (±$414) | $80,734 |
| Median home value | $779,100 (±$58,019) | $859,900 (±$4,853) | $564,600 (±$1,940) | $332,700 |
| Median real estate taxes (a year) | $5,753 (±$657) | $7,114 (±$40) | $4,556 (±$16) | $3,119 |
| Built before 1980 | 18.8% (±6.0 points) | 45.5% (±0.5 points) | 43.4% (±0.3 points) | 49.7% |
| Average commute | 37.5 minutes (±4.4) | 27.6 minutes (±0.2) | 26.6 minutes (±0.1) | 26.4 minutes |
| Households with broadband | 95.9% (±3.5 points) | 95.1% (±0.2 points) | 93.6% (±0.1 points) | 91.0% |
| Median age of residents | 38.1 years (±3.9) | 37.4 years (±0.2) | 38.3 years (±0.1) | 38.9 years |
Black Diamond covers 6.6 square miles of land, about 903 residents per square mile (Census Bureau Gazetteer).
How Black Diamond has changed since 2015–2019
| 2015–2019 | 2020–2024 | Amount of change | Verdict | |
|---|---|---|---|---|
| Residents | 4,476 (±60) | 5,961 (±26) | +33.2% | Measurable increase |
| Housing units | 1,822 (±150) | 2,442 (±157) | +34.0% | Measurable increase |
| Median gross rent | $1,065 (±$782) | $1,453 (±$1,098) | +36.4% | No measurable change after inflation |
| Median home value | $413,100 (±$33,689) | $779,100 (±$58,019) | +88.6% | Up after inflation |
| Median household income | $108,490 (±$24,487) | $141,383 (±$13,982) | +30.3% | No measurable change after inflation |
| Median owner cost with a mortgage | $2,317 (±$201) | $3,068 (±$233) | +32.4% | No measurable change after inflation |
| Median real estate taxes | $4,477 (±$394) | $5,753 (±$657) | +28.5% | No measurable change after inflation |
| Households that rent | 15.5% (±5.3 points) | 14.0% (±5.4 points) | −1.5 percentage points | Not a measurable change |
| Rental vacancy rate | 14.7% (±15.5 points) | 0.0% (±11.6 points) | −14.7 percentage points | Not a measurable change |
The Census Bureau publishes 2015–2019 dollars in 2019 dollars and 2020–2024 dollars in 2024 dollars.
Prices (the CPI-U, US Bureau of Labor Statistics) rose 22.7% between 2019 and 2024, so a dollar figure’s verdict compares the two after raising the earlier one by that much, using the Census Bureau’s test for a difference.
The two periods do not overlap, as the Census Bureau recommends for 5-year estimates.
Crime reported to police in Black Diamond
In 2025, the Black Diamond Police Department reported 41 violent and 447 property crimes per 100,000 residents to the FBI.
Across King County, the departments that report recorded 350 violent and 2,711 property crimes per 100,000 residents that year.
ZIP codes in Black Diamond
| ZIP code | Share of the ZIP’s land in this place | Residents | Median gross rent | Median home value | Median household income |
|---|---|---|---|---|---|
| 98010 | 43% | 6,857 | $1,657 | $775,400 | $142,048 |
A ZIP code is a mail route rather than a boundary, so the Census Bureau publishes figures for ZIP Code Tabulation Areas built from census blocks; the share column says how much of each one’s land lies in this place.
Places near Black Diamond
| Place | Distance | Median gross rent | Median home value | Households that rent |
|---|---|---|---|---|
| Maple Valley | 3.7 mi | $2,304 | $724,700 | 16.8% |
| Lake Morton-Berrydale | 4.2 mi | $2,017 | $714,200 | 11.4% |
| Lake Holm | 5.3 mi | — | $828,600 | 4.0% |
| Covington | 5.3 mi | $2,232 | $637,300 | 21.1% |
| Hobart | 6.7 mi | $2,726 | $950,300 | 4.8% |
| Shadow Lake | 6.9 mi | $3,043 | $816,300 | 15.4% |
| Enumclaw | 7.9 mi | $1,954 | $524,600 | 25.7% |
| Auburn | 9.0 mi | $1,786 | $547,900 | 39.4% |
Places in Washington most like Black Diamond
| Place | Median gross rent | Median home value | Median household income | Households that rent |
|---|---|---|---|---|
| Chain Lake | $1,755 | $873,000 | $161,286 | 11.2% |
| Sisco Heights | $1,701 | $735,000 | $119,158 | 13.2% |
| Lochsloy | $1,250 | $610,200 | $106,484 | 15.6% |
| Three Lakes | $1,730 | $842,800 | $172,879 | 3.8% |
| Lake Goodwin | $1,316 | $718,400 | $105,437 | 5.9% |
| Key Center | $1,705 | $613,200 | $105,781 | 12.3% |
Matched on rent, home value, income, the share who rent, the age of the homes, the share in apartment buildings and the commute, each measured against the spread across Washington.
HUD Fair Market Rent for Black Diamond, fiscal year 2027
| Studio | 1 bedroom | 2 bedrooms | 3 bedrooms | 4 bedrooms |
|---|---|---|---|---|
| $2,091 | $2,180 | $2,549 | $3,324 | $3,954 |
HUD also publishes a Small Area Fair Market Rent for each ZIP code in the area; the Fair Market Rent page for this place lists its ZIP codes.
HUD income limits for Black Diamond, fiscal year 2026
| Household size | Extremely low (30%) | Very low (50%) | Low (80%) |
|---|---|---|---|
| 1 person | $34,550 | $57,550 | $81,700 |
| 2 people | $39,450 | $65,800 | $93,350 |
| 3 people | $44,400 | $74,000 | $105,000 |
| 4 people | $49,300 | $82,200 | $116,650 |
| 5 people | $53,250 | $88,800 | $126,000 |
| 6 people | $57,200 | $95,400 | $135,350 |
| 7 people | $61,150 | $101,950 | $144,650 |
| 8 people | $65,100 | $108,550 | $154,000 |
These are the limits HUD sets for its housing programs in the Seattle-Bellevue, WA HUD Metro FMR Area, where HUD’s median family income for fiscal year 2026 is $164,400.
A program can use its own limits; tax-credit and local programs often do.
Survey years: 2020–2024 (American Community Survey 5-year estimates), compared with 2015–2019.
Margins of error are at the 90% confidence level.
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Questions about Black Diamond
How much is a two-bedroom apartment in Black Diamond?
The median gross rent for a two-bedroom home in Black Diamond, WA is $1,140 (±$163) a month (2020–2024 American Community Survey).
How many renters are there in Black Diamond?
Black Diamond has an estimated 325 (±127) renting households, 14.0% of its occupied homes (2020–2024 American Community Survey).
What is the median household income in Black Diamond?
The median household income in Black Diamond is $141,383 (±$13,982) a year (2020–2024 American Community Survey).
What is the average home value in Black Diamond, WA?
The Census Bureau publishes the median: $779,100 (±$58,019) for owner-occupied homes in Black Diamond (2020–2024 American Community Survey).
What is the average mortgage payment in Black Diamond?
The Census Bureau publishes total owner costs rather than the mortgage alone: the median for owners with a mortgage in Black Diamond, WA is $3,068 (±$233) a month, including taxes, insurance and utilities.
How much are property taxes in Black Diamond?
The median real estate tax paid by homeowners in Black Diamond, WA is $5,753 (±$657) a year (2020–2024 American Community Survey).
Is Black Diamond growing?
In Black Diamond, the number of residents went from 4,476 in 2015–2019 to 5,961 in 2020–2024 (+33.2%), a measurable increase.
What ZIP codes are in Black Diamond?
The ZIP code that covers Black Diamond is 98010.
What is the median rent in ZIP code 98010?
The median gross rent in ZIP Code Tabulation Area 98010 is $1,657 (±$726) a month (2020–2024 American Community Survey).
Sources
- Demographic and Housing Estimates (DP05), 2020–2024 ACS 5-year estimates — Black Diamond city, Washington
- Selected Housing Characteristics (DP04), 2020–2024 ACS 5-year estimates — Black Diamond city, Washington
- Selected Economic Characteristics (DP03), 2020–2024 ACS 5-year estimates — Black Diamond city, Washington
- Median Real Estate Taxes Paid by Mortgage Status (B25103), 2020–2024 ACS 5-year estimates — Black Diamond city, Washington
- Selected Social Characteristics (DP02), 2020–2024 ACS 5-year estimates — Black Diamond city, Washington
- Total Population (B01003), 2015–2019 ACS 5-year estimates — Black Diamond city, Washington
- Median Gross Rent (B25064), 2015–2019 ACS 5-year estimates — Black Diamond city, Washington
- HUD Fair Market Rents, fiscal year 2027: Seattle-Bellevue, WA HUD Metro FMR Area
- HUD Small Area Fair Market Rents, fiscal year 2027
- HUD Income Limits, fiscal year 2026: Seattle-Bellevue, WA HUD Metro FMR Area
- US Census Bureau, American Community Survey 2020–2024 5-year estimates for ZIP Code Tabulation Areas
- FBI Uniform Crime Reporting Program, Crime Data Explorer: Black Diamond Police Department (ORI WA0171500)
- FBI: Uniform Crime Reporting statistics and their proper use
- Consumer Price Index for All Urban Consumers (CPI-U), US city average, all items, US Bureau of Labor Statistics: annual averages 2019 and 2024
- US Census Bureau, 2024 Gazetteer Files
To check these figures in the Census Bureau’s own API, request the variables below from the 2024 ACS 5-year data profile (acs/acs5/profile) for Black Diamond city, Washington (place:06330, in state:53).
Each estimate (E or PE) has a margin of error beside it (M or PM).
The 2015–2019 figures are B01003_001E, B01003_001M, B25064_001E, B25064_001M from the 2019 release.
The API needs a free key.
DP05_0001E, DP05_0001M, DP04_0001E, DP04_0001M, DP04_0047PE, DP04_0047PM, DP04_0134E, DP04_0134M, DP03_0062E, DP03_0062M, DP04_0089E, DP04_0089M
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Figures are published by the US Census Bureau, HUD, the Bureau of Labor Statistics and the FBI; Seayora reproduces them and does not adjust them, except where a sentence says it compares dollar figures after inflation. They describe the whole place, not any one building or street, and are not an appraisal, a rent determination, a tax bill, a safety rating or legal advice.
Figures last updated on .