What kinds of homes are in Black Diamond, WA?

Name: Types of homes in Black Diamond, WA, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

Black Diamond, WA has 2,442 (±157) homes (2020–2024 American Community Survey).

That is about 370 homes per square mile of land.

84.9% are detached single-family houses.

2.3% are in buildings of two to four units.

3.8% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 2,442 (±157)
Detached houses: 84.9%
2–4 unit buildings: 2.3%
5+ unit buildings: 3.8%

Homes in Black Diamond by building size

Housing units by units in structure, 2020–2024
Building type	Black Diamond	King County	Washington	United States
Single-family, detached	84.9% (±6.4 points)	50.0%	61.9%	61.3%
Single-family, attached (townhouse, rowhouse)	5.2% (±4.1 points)	5.4%	4.4%	6.2%
2 units	0.0% (±1.6 points)	1.6%	2.3%	3.4%
3 or 4 units	2.3% (±2.7 points)	3.8%	3.5%	4.3%
5 to 9 units	0.0% (±1.6 points)	5.7%	4.3%	4.5%
10 to 19 units	1.8% (±2.0 points)	6.7%	4.9%	4.3%
20 or more units	2.0% (±3.0 points)	25.2%	13.0%	10.3%
Mobile home	2.6% (±2.7 points)	1.4%	5.5%	5.6%
Boat, RV, van, etc.	1.3% (±1.9 points)	0.1%	0.3%	0.1%

In Black Diamond, the share of homes in buildings of five or more units is lower than in King County (37.6%).

It is also lower than in Washington (22.2%).

It is lower than the national figure (19.1%).

Homes in buildings of 5 or more units in places near Black Diamond

Nearest places with a published estimate, compared with Black Diamond
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Black Diamond	—	3.8% (±3.9 points)	—
Maple Valley	3.7 mi	8.5% (±2.3 points)	Higher
Lake Morton-Berrydale	4.2 mi	0.0% (±1.7 points)	Not measurably different
Lake Holm	5.3 mi	0.0% (±4.8 points)	Not measurably different
Covington	5.3 mi	9.7% (±2.4 points)	Higher
Hobart	6.7 mi	0.0% (±2.8 points)	Not measurably different
Shadow Lake	6.9 mi	0.0% (±8.1 points)	Not measurably different
Enumclaw	7.9 mi	8.6% (±3.4 points)	Not measurably different
Auburn	9.0 mi	25.7% (±2.1 points)	Higher

Nearby places with a measurably higher figure: Maple Valley, WA (8.5%), Covington, WA (9.7%), Auburn, WA (25.7%).

Distance is measured in a straight line between the Census Bureau’s internal points for each place.

Homes in buildings of 5 or more units across King County, place by place

Rank	Place	Homes in buildings of 5 or more units
31	Enumclaw	8.6% (±3.4 points)
32	Maple Valley	8.5% (±2.3 points)
33	Union Hill-Novelty Hill	7.3% (±1.6 points)
34	Snoqualmie	5.3% (±2.1 points)
35 (tie)	Carnation	5.2% (±6.4 points)
35 (tie)	Vashon	5.2% (±2.8 points)
37	Black Diamond	3.8% (±3.9 points)
38	Hunts Point	3.3% (±33.2 points)
39	Lakeland South	2.9% (±1.7 points)
40	Algona	1.6% (±6.2 points)
41 (tie)	Clyde Hill	1.4% (±4.7 points)
41 (tie)	Duvall	1.4% (±3.1 points)
41 (tie)	East Renton Highlands	1.4% (±2.0 points)

Showing 13 of 59 places in King County, ranked from highest to lowest.

Survey years: 2020–2024 (American Community Survey 5-year estimates).

Margins of error are at the 90% confidence level.

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Questions about Black Diamond

How many homes are in Black Diamond?

Black Diamond, WA has an estimated 2,442 (±157) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Black Diamond houses or apartments?

84.9% are detached houses and 5.2% attached houses, while 6.1% are in buildings of two or more units.

How many two-family and small multifamily homes are in Black Diamond?

2.3% of homes in Black Diamond are in buildings of two to four units, the small rental buildings that are often owner-occupied.

Sources

Selected Housing Characteristics (DP04), 2020–2024 ACS 5-year estimates — Black Diamond city, Washington

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 API needs a free key.

Request a Census API key.

DP04_0001E, DP04_0001M, DP04_0007PE, DP04_0007PM, DP04_0008PE, DP04_0008PM, DP04_0009PE, DP04_0009PM, DP04_0010PE, DP04_0010PM, DP04_0011PE, DP04_0011PM, DP04_0012PE, DP04_0012PM, DP04_0013PE, DP04_0013PM, DP04_0014PE, DP04_0014PM, DP04_0015PE, DP04_0015PM

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.