Black Diamond vs Mirrormont

A side-by-side comparison of Black Diamond and Mirrormont: population, income, housing, and more.

Black Diamond and Mirrormont are places in Washington. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Black Diamond has the higher population (5,678 vs 4,217 in Mirrormont). Mirrormont has the higher median household income ($182,283 vs $144,728 in Black Diamond). Mirrormont has the higher median home value ($950,100 vs $776,400 in Black Diamond).

Population, income & housing

	Black Diamond	Mirrormont
Population	5,678	4,217
Median age	38.1 yrs	43.5 yrs
Median household income	$144,728	$182,283
Median home value	$776,400	$950,100
Median gross rent	$2,340	—
Housing units	2,296	1,596
Homeownership rate	87.0%	92.8%
Bachelor's degree or higher	56.5%	62.0%
Unemployment rate	1.1%	2.9%

Trends (ACS 5-year, 2019–2023)

	Black Diamond	Mirrormont
Population	4,476 → 5,678 (+26.9%)	3,780 → 4,217 (+11.6%)
Median household income	$108,490 → $144,728 (+33.4%)	$125,453 → $182,283 (+45.3%)
Median home value	$413,100 → $776,400 (+87.9%)	$634,400 → $950,100 (+49.8%)
Median gross rent	$1,065 → $2,340 (+119.7%)	—

Black Diamond

Population

4,4765,678

Median household income

$108,490$144,728

Median home value

$413,100$776,400

Median gross rent

$1,065$2,340

Mirrormont

Population

3,7804,217

Median household income

$125,453$182,283

Median home value

$634,400$950,100

Age & race/ethnicity

Age distribution (share)

	Black Diamond	Mirrormont
Under 5	6.3%	5.4%
5 to 17	18.4%	15.0%
18 to 24	5.5%	4.7%
25 to 34	14.4%	9.9%
35 to 44	19.1%	17.5%
45 to 54	10.6%	13.1%
55 to 64	14.6%	14.2%
65 to 74	6.6%	11.7%
75 and over	4.4%	8.3%

Race & ethnicity (share)

	Black Diamond	Mirrormont
White (non-Hispanic)	73.8%	82.2%
Black or African American	0.4%	0.0%
American Indian & Alaska Native	0.0%	0.0%
Asian	11.4%	6.9%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.6%	0.0%
Two or more races	4.3%	5.5%
Hispanic or Latino	9.5%	5.5%

Educational attainment (age 25+)

Share of adults 25+

	Black Diamond	Mirrormont
No high school diploma	1.2%	3.6%
High school graduate	12.9%	9.5%
Some college or associate's	29.4%	24.9%
Bachelor's degree	37.0%	40.8%
Graduate or professional degree	19.4%	21.2%

Commute to work

How workers get to work (share)

	Black Diamond	Mirrormont
Drove alone	68.8%	51.9%
Carpooled	7.1%	5.1%
Public transit	0.3%	3.9%
Walked	1.1%	0.0%
Bicycle	0.0%	0.4%
Worked from home	21.5%	36.1%
Other means	1.0%	2.5%

Housing

Units in structure (share)

	Black Diamond	Mirrormont
1-unit, detached	91.2%	94.9%
1-unit, attached	2.0%	1.7%
2 to 4 units	0.5%	0.0%
5 to 19 units	0.0%	0.0%
20 or more units	2.7%	0.0%
Mobile home & other	3.7%	3.4%

Poverty & households

	Black Diamond	Mirrormont
Poverty rate	1.1%	2.8%
Average household size	2.60	2.73
Mean commute (minutes)	37	37
Median year structure built	1997	1978